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Finding the Fourth Proportional to 431,455.88, 647,140.08 and 115,871.78

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Solution

The fourth proportional to 431,455.88, 647,140.08 and 115,871.78 is: 173,795.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,455.88 : 647,140.08 = 115,871.78 : x
  2. Step 2: Convert to fraction form
    431,455.88/647,140.08 = 115,871.78/x
  3. Step 3: Cross multiply
    431,455.88x = 647,140.08 × 115,871.78
  4. Step 4: Simplify right side
    431,455.88x = 74,985,272,978.94
  5. Step 5: Solve for x
    x = 74,985,272,978.94/431,455.88
  6. Step 6: Final answer
    x = 173,795.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.