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Finding the Fourth Proportional to 266.29, 398.72 and 143.98

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Solution

The fourth proportional to 266.29, 398.72 and 143.98 is: 215.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.29 : 398.72 = 143.98 : x
  2. Step 2: Convert to fraction form
    266.29/398.72 = 143.98/x
  3. Step 3: Cross multiply
    266.29x = 398.72 × 143.98
  4. Step 4: Simplify right side
    266.29x = 57,407.07
  5. Step 5: Solve for x
    x = 57,407.07/266.29
  6. Step 6: Final answer
    x = 215.58

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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.