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Finding the Fourth Proportional to 108,691.96, 162,780.20 and 86,130.08

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Solution

The fourth proportional to 108,691.96, 162,780.20 and 86,130.08 is: 128,990.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,691.96 : 162,780.20 = 86,130.08 : x
  2. Step 2: Convert to fraction form
    108,691.96/162,780.20 = 86,130.08/x
  3. Step 3: Cross multiply
    108,691.96x = 162,780.20 × 86,130.08
  4. Step 4: Simplify right side
    108,691.96x = 14,020,272,252.92
  5. Step 5: Solve for x
    x = 14,020,272,252.92/108,691.96
  6. Step 6: Final answer
    x = 128,990.89

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1.5x scale

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.