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Finding the Fourth Proportional to 710,986.74, 981,165.16 and 388,696.85

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Solution

The fourth proportional to 710,986.74, 981,165.16 and 388,696.85 is: 536,403.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    710,986.74 : 981,165.16 = 388,696.85 : x
  2. Step 2: Convert to fraction form
    710,986.74/981,165.16 = 388,696.85/x
  3. Step 3: Cross multiply
    710,986.74x = 981,165.16 × 388,696.85
  4. Step 4: Simplify right side
    710,986.74x = 381,375,807,021.75
  5. Step 5: Solve for x
    x = 381,375,807,021.75/710,986.74
  6. Step 6: Final answer
    x = 536,403.54

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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.