Home / 715,721,274,357.12-987,716,316,081.60-390,581,517,006.72

Finding the Fourth Proportional to 715,721,274,357.12, 987,716,316,081.60 and 390,581,517,006.72

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Solution

The fourth proportional to 715,721,274,357.12, 987,716,316,081.60 and 390,581,517,006.72 is: 539,013,930,323.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,721,274,357.12 : 987,716,316,081.60 = 390,581,517,006.72 : x
  2. Step 2: Convert to fraction form
    715,721,274,357.12/987,716,316,081.60 = 390,581,517,006.72/x
  3. Step 3: Cross multiply
    715,721,274,357.12x = 987,716,316,081.60 × 390,581,517,006.72
  4. Step 4: Simplify right side
    715,721,274,357.12x = 385,783,737,107,440,268,738,560
  5. Step 5: Solve for x
    x = 385,783,737,107,440,268,738,560/715,721,274,357.12
  6. Step 6: Final answer
    x = 539,013,930,323.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.