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Finding the Fourth Proportional to 266.90, 399.99 and 129.53

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Solution

The fourth proportional to 266.90, 399.99 and 129.53 is: 194.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.90 : 399.99 = 129.53 : x
  2. Step 2: Convert to fraction form
    266.90/399.99 = 129.53/x
  3. Step 3: Cross multiply
    266.90x = 399.99 × 129.53
  4. Step 4: Simplify right side
    266.90x = 51,812.19
  5. Step 5: Solve for x
    x = 51,812.19/266.90
  6. Step 6: Final answer
    x = 194.13

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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.