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Finding the Fourth Proportional to 709,830.72, 979,567.98 and 387,540.90

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Solution

The fourth proportional to 709,830.72, 979,567.98 and 387,540.90 is: 534,807.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,830.72 : 979,567.98 = 387,540.90 : x
  2. Step 2: Convert to fraction form
    709,830.72/979,567.98 = 387,540.90/x
  3. Step 3: Cross multiply
    709,830.72x = 979,567.98 × 387,540.90
  4. Step 4: Simplify right side
    709,830.72x = 379,622,656,580.38
  5. Step 5: Solve for x
    x = 379,622,656,580.38/709,830.72
  6. Step 6: Final answer
    x = 534,807.31

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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.