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Finding the Fourth Proportional to 715,523.88, 987,207.42 and 428,939.40

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Solution

The fourth proportional to 715,523.88, 987,207.42 and 428,939.40 is: 591,807.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,523.88 : 987,207.42 = 428,939.40 : x
  2. Step 2: Convert to fraction form
    715,523.88/987,207.42 = 428,939.40/x
  3. Step 3: Cross multiply
    715,523.88x = 987,207.42 × 428,939.40
  4. Step 4: Simplify right side
    715,523.88x = 423,452,158,410.35
  5. Step 5: Solve for x
    x = 423,452,158,410.35/715,523.88
  6. Step 6: Final answer
    x = 591,807.16

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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.