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Finding the Fourth Proportional to 108,154.34, 162,005.21 and 86,979.92

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Solution

The fourth proportional to 108,154.34, 162,005.21 and 86,979.92 is: 130,287.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,154.34 : 162,005.21 = 86,979.92 : x
  2. Step 2: Convert to fraction form
    108,154.34/162,005.21 = 86,979.92/x
  3. Step 3: Cross multiply
    108,154.34x = 162,005.21 × 86,979.92
  4. Step 4: Simplify right side
    108,154.34x = 14,091,199,770.48
  5. Step 5: Solve for x
    x = 14,091,199,770.48/108,154.34
  6. Step 6: Final answer
    x = 130,287.89

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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.