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Finding the Fourth Proportional to 108,700.80, 162,856.80 and 91,982.40

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Solution

The fourth proportional to 108,700.80, 162,856.80 and 91,982.40 is: 137,809.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,700.80 : 162,856.80 = 91,982.40 : x
  2. Step 2: Convert to fraction form
    108,700.80/162,856.80 = 91,982.40/x
  3. Step 3: Cross multiply
    108,700.80x = 162,856.80 × 91,982.40
  4. Step 4: Simplify right side
    108,700.80x = 14,979,959,320.32
  5. Step 5: Solve for x
    x = 14,979,959,320.32/108,700.80
  6. Step 6: Final answer
    x = 137,809.10

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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.