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Finding the Fourth Proportional to 266.19, 399.18 and 129.20

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Solution

The fourth proportional to 266.19, 399.18 and 129.20 is: 193.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.19 : 399.18 = 129.20 : x
  2. Step 2: Convert to fraction form
    266.19/399.18 = 129.20/x
  3. Step 3: Cross multiply
    266.19x = 399.18 × 129.20
  4. Step 4: Simplify right side
    266.19x = 51,572.06
  5. Step 5: Solve for x
    x = 51,572.06/266.19
  6. Step 6: Final answer
    x = 193.74

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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.