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Finding the Fourth Proportional to 715,667.97, 987,608.50 and 393,371.17

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Solution

The fourth proportional to 715,667.97, 987,608.50 and 393,371.17 is: 542,844.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,667.97 : 987,608.50 = 393,371.17 : x
  2. Step 2: Convert to fraction form
    715,667.97/987,608.50 = 393,371.17/x
  3. Step 3: Cross multiply
    715,667.97x = 987,608.50 × 393,371.17
  4. Step 4: Simplify right side
    715,667.97x = 388,496,711,146.95
  5. Step 5: Solve for x
    x = 388,496,711,146.95/715,667.97
  6. Step 6: Final answer
    x = 542,844.90

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1.5x scale

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.