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Finding the Fourth Proportional to 266.10, 398.94 and 129.20

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Solution

The fourth proportional to 266.10, 398.94 and 129.20 is: 193.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.10 : 398.94 = 129.20 : x
  2. Step 2: Convert to fraction form
    266.10/398.94 = 129.20/x
  3. Step 3: Cross multiply
    266.10x = 398.94 × 129.20
  4. Step 4: Simplify right side
    266.10x = 51,543.05
  5. Step 5: Solve for x
    x = 51,543.05/266.10
  6. Step 6: Final answer
    x = 193.70

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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.