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Finding the Fourth Proportional to 88,981.20, 133,471.80 and 85,870.80

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Solution

The fourth proportional to 88,981.20, 133,471.80 and 85,870.80 is: 128,806.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    88,981.20 : 133,471.80 = 85,870.80 : x
  2. Step 2: Convert to fraction form
    88,981.20/133,471.80 = 85,870.80/x
  3. Step 3: Cross multiply
    88,981.20x = 133,471.80 × 85,870.80
  4. Step 4: Simplify right side
    88,981.20x = 11,461,330,243.44
  5. Step 5: Solve for x
    x = 11,461,330,243.44/88,981.20
  6. Step 6: Final answer
    x = 128,806.20

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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.