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Finding the Fourth Proportional to 108,905.80, 163,358.70 and 81,257.80

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Solution

The fourth proportional to 108,905.80, 163,358.70 and 81,257.80 is: 121,886.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,905.80 : 163,358.70 = 81,257.80 : x
  2. Step 2: Convert to fraction form
    108,905.80/163,358.70 = 81,257.80/x
  3. Step 3: Cross multiply
    108,905.80x = 163,358.70 × 81,257.80
  4. Step 4: Simplify right side
    108,905.80x = 13,274,168,572.86
  5. Step 5: Solve for x
    x = 13,274,168,572.86/108,905.80
  6. Step 6: Final answer
    x = 121,886.70

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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.