Home / 715,724.12-987,711.56-393,447.80

Finding the Fourth Proportional to 715,724.12, 987,711.56 and 393,447.80

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Solution

The fourth proportional to 715,724.12, 987,711.56 and 393,447.80 is: 542,964.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,724.12 : 987,711.56 = 393,447.80 : x
  2. Step 2: Convert to fraction form
    715,724.12/987,711.56 = 393,447.80/x
  3. Step 3: Cross multiply
    715,724.12x = 987,711.56 × 393,447.80
  4. Step 4: Simplify right side
    715,724.12x = 388,612,933,410.77
  5. Step 5: Solve for x
    x = 388,612,933,410.77/715,724.12
  6. Step 6: Final answer
    x = 542,964.71

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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.