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Finding the Fourth Proportional to 89,920.80, 134,881.20 and 86,081.40

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Solution

The fourth proportional to 89,920.80, 134,881.20 and 86,081.40 is: 129,122.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    89,920.80 : 134,881.20 = 86,081.40 : x
  2. Step 2: Convert to fraction form
    89,920.80/134,881.20 = 86,081.40/x
  3. Step 3: Cross multiply
    89,920.80x = 134,881.20 × 86,081.40
  4. Step 4: Simplify right side
    89,920.80x = 11,610,762,529.68
  5. Step 5: Solve for x
    x = 11,610,762,529.68/89,920.80
  6. Step 6: Final answer
    x = 129,122.10

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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.