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Finding the Fourth Proportional to 715,523.28, 987,445.80 and 393,244.80

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Solution

The fourth proportional to 715,523.28, 987,445.80 and 393,244.80 is: 542,690.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,523.28 : 987,445.80 = 393,244.80 : x
  2. Step 2: Convert to fraction form
    715,523.28/987,445.80 = 393,244.80/x
  3. Step 3: Cross multiply
    715,523.28x = 987,445.80 × 393,244.80
  4. Step 4: Simplify right side
    715,523.28x = 388,307,926,131.84
  5. Step 5: Solve for x
    x = 388,307,926,131.84/715,523.28
  6. Step 6: Final answer
    x = 542,690.83

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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.