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Finding the Fourth Proportional to 129.40, 193.72 and 117.80

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Solution

The fourth proportional to 129.40, 193.72 and 117.80 is: 176.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.40 : 193.72 = 117.80 : x
  2. Step 2: Convert to fraction form
    129.40/193.72 = 117.80/x
  3. Step 3: Cross multiply
    129.40x = 193.72 × 117.80
  4. Step 4: Simplify right side
    129.40x = 22,820.22
  5. Step 5: Solve for x
    x = 22,820.22/129.40
  6. Step 6: Final answer
    x = 176.35

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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.