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Finding the Fourth Proportional to 136,979.20, 205,598.40 and 84,491.20

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Solution

The fourth proportional to 136,979.20, 205,598.40 and 84,491.20 is: 126,816.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,979.20 : 205,598.40 = 84,491.20 : x
  2. Step 2: Convert to fraction form
    136,979.20/205,598.40 = 84,491.20/x
  3. Step 3: Cross multiply
    136,979.20x = 205,598.40 × 84,491.20
  4. Step 4: Simplify right side
    136,979.20x = 17,371,255,534.08
  5. Step 5: Solve for x
    x = 17,371,255,534.08/136,979.20
  6. Step 6: Final answer
    x = 126,816.74

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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.