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Finding the Fourth Proportional to 715,315.80, 987,152.13 and 393,005.46

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Solution

The fourth proportional to 715,315.80, 987,152.13 and 393,005.46 is: 542,356.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,315.80 : 987,152.13 = 393,005.46 : x
  2. Step 2: Convert to fraction form
    715,315.80/987,152.13 = 393,005.46/x
  3. Step 3: Cross multiply
    715,315.80x = 987,152.13 × 393,005.46
  4. Step 4: Simplify right side
    715,315.80x = 387,956,176,940.63
  5. Step 5: Solve for x
    x = 387,956,176,940.63/715,315.80
  6. Step 6: Final answer
    x = 542,356.50

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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.