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Finding the Fourth Proportional to 119.80, 165.54 and 87.13

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Solution

The fourth proportional to 119.80, 165.54 and 87.13 is: 120.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.80 : 165.54 = 87.13 : x
  2. Step 2: Convert to fraction form
    119.80/165.54 = 87.13/x
  3. Step 3: Cross multiply
    119.80x = 165.54 × 87.13
  4. Step 4: Simplify right side
    119.80x = 14,423.50
  5. Step 5: Solve for x
    x = 14,423.50/119.80
  6. Step 6: Final answer
    x = 120.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.