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Finding the Fourth Proportional to 715,307.91, 987,121.92 and 393,017.01

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Solution

The fourth proportional to 715,307.91, 987,121.92 and 393,017.01 is: 542,361.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,307.91 : 987,121.92 = 393,017.01 : x
  2. Step 2: Convert to fraction form
    715,307.91/987,121.92 = 393,017.01/x
  3. Step 3: Cross multiply
    715,307.91x = 987,121.92 × 393,017.01
  4. Step 4: Simplify right side
    715,307.91x = 387,955,705,503.86
  5. Step 5: Solve for x
    x = 387,955,705,503.86/715,307.91
  6. Step 6: Final answer
    x = 542,361.83

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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.