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Finding the Fourth Proportional to 80,398.52, 120,558.90 and 47,129.40

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Solution

The fourth proportional to 80,398.52, 120,558.90 and 47,129.40 is: 70,671.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,398.52 : 120,558.90 = 47,129.40 : x
  2. Step 2: Convert to fraction form
    80,398.52/120,558.90 = 47,129.40/x
  3. Step 3: Cross multiply
    80,398.52x = 120,558.90 × 47,129.40
  4. Step 4: Simplify right side
    80,398.52x = 5,681,868,621.66
  5. Step 5: Solve for x
    x = 5,681,868,621.66/80,398.52
  6. Step 6: Final answer
    x = 70,671.31

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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.