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Finding the Fourth Proportional to 109,671.28, 151,345.20 and 61,921.78

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Solution

The fourth proportional to 109,671.28, 151,345.20 and 61,921.78 is: 85,451.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,671.28 : 151,345.20 = 61,921.78 : x
  2. Step 2: Convert to fraction form
    109,671.28/151,345.20 = 61,921.78/x
  3. Step 3: Cross multiply
    109,671.28x = 151,345.20 × 61,921.78
  4. Step 4: Simplify right side
    109,671.28x = 9,371,564,178.46
  5. Step 5: Solve for x
    x = 9,371,564,178.46/109,671.28
  6. Step 6: Final answer
    x = 85,451.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.