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Finding the Fourth Proportional to 715,522.38, 987,205.35 and 428,937.90

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Solution

The fourth proportional to 715,522.38, 987,205.35 and 428,937.90 is: 591,805.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,522.38 : 987,205.35 = 428,937.90 : x
  2. Step 2: Convert to fraction form
    715,522.38/987,205.35 = 428,937.90/x
  3. Step 3: Cross multiply
    715,522.38x = 987,205.35 × 428,937.90
  4. Step 4: Simplify right side
    715,522.38x = 423,449,789,697.77
  5. Step 5: Solve for x
    x = 423,449,789,697.77/715,522.38
  6. Step 6: Final answer
    x = 591,805.09

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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.