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Finding the Fourth Proportional to 78,981.60, 118,472.40 and 49,432.80

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Solution

The fourth proportional to 78,981.60, 118,472.40 and 49,432.80 is: 74,149.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,981.60 : 118,472.40 = 49,432.80 : x
  2. Step 2: Convert to fraction form
    78,981.60/118,472.40 = 49,432.80/x
  3. Step 3: Cross multiply
    78,981.60x = 118,472.40 × 49,432.80
  4. Step 4: Simplify right side
    78,981.60x = 5,856,422,454.72
  5. Step 5: Solve for x
    x = 5,856,422,454.72/78,981.60
  6. Step 6: Final answer
    x = 74,149.20

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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.