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Finding the Fourth Proportional to 128,460.80, 192,691.20 and 54,579.20

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Solution

The fourth proportional to 128,460.80, 192,691.20 and 54,579.20 is: 81,868.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,460.80 : 192,691.20 = 54,579.20 : x
  2. Step 2: Convert to fraction form
    128,460.80/192,691.20 = 54,579.20/x
  3. Step 3: Cross multiply
    128,460.80x = 192,691.20 × 54,579.20
  4. Step 4: Simplify right side
    128,460.80x = 10,516,931,543.04
  5. Step 5: Solve for x
    x = 10,516,931,543.04/128,460.80
  6. Step 6: Final answer
    x = 81,868.80

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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.