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Finding the Fourth Proportional to 98,981.76, 136,517.76 and 61,276.80

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Solution

The fourth proportional to 98,981.76, 136,517.76 and 61,276.80 is: 84,514.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,981.76 : 136,517.76 = 61,276.80 : x
  2. Step 2: Convert to fraction form
    98,981.76/136,517.76 = 61,276.80/x
  3. Step 3: Cross multiply
    98,981.76x = 136,517.76 × 61,276.80
  4. Step 4: Simplify right side
    98,981.76x = 8,365,371,475.97
  5. Step 5: Solve for x
    x = 8,365,371,475.97/98,981.76
  6. Step 6: Final answer
    x = 84,514.27

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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.