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Finding the Fourth Proportional to 118,695.40, 178,431.90 and 83,876.20

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Solution

The fourth proportional to 118,695.40, 178,431.90 and 83,876.20 is: 126,089.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    118,695.40 : 178,431.90 = 83,876.20 : x
  2. Step 2: Convert to fraction form
    118,695.40/178,431.90 = 83,876.20/x
  3. Step 3: Cross multiply
    118,695.40x = 178,431.90 × 83,876.20
  4. Step 4: Simplify right side
    118,695.40x = 14,966,189,730.78
  5. Step 5: Solve for x
    x = 14,966,189,730.78/118,695.40
  6. Step 6: Final answer
    x = 126,089.05

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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.