Home / 715,723.87-987,711.21-393,447.55

Finding the Fourth Proportional to 715,723.87, 987,711.21 and 393,447.55

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Solution

The fourth proportional to 715,723.87, 987,711.21 and 393,447.55 is: 542,964.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,723.87 : 987,711.21 = 393,447.55 : x
  2. Step 2: Convert to fraction form
    715,723.87/987,711.21 = 393,447.55/x
  3. Step 3: Cross multiply
    715,723.87x = 987,711.21 × 393,447.55
  4. Step 4: Simplify right side
    715,723.87x = 388,612,555,682.04
  5. Step 5: Solve for x
    x = 388,612,555,682.04/715,723.87
  6. Step 6: Final answer
    x = 542,964.36

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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.