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Finding the Fourth Proportional to 88,688.60, 133,032.90 and 81,981.80

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Solution

The fourth proportional to 88,688.60, 133,032.90 and 81,981.80 is: 122,972.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,688.60 : 133,032.90 = 81,981.80 : x
  2. Step 2: Convert to fraction form
    88,688.60/133,032.90 = 81,981.80/x
  3. Step 3: Cross multiply
    88,688.60x = 133,032.90 × 81,981.80
  4. Step 4: Simplify right side
    88,688.60x = 10,906,276,601.22
  5. Step 5: Solve for x
    x = 10,906,276,601.22/88,688.60
  6. Step 6: Final answer
    x = 122,972.70

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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.