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Finding the Fourth Proportional to 143.20, 215.04 and 135.90

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Solution

The fourth proportional to 143.20, 215.04 and 135.90 is: 204.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.20 : 215.04 = 135.90 : x
  2. Step 2: Convert to fraction form
    143.20/215.04 = 135.90/x
  3. Step 3: Cross multiply
    143.20x = 215.04 × 135.90
  4. Step 4: Simplify right side
    143.20x = 29,223.47
  5. Step 5: Solve for x
    x = 29,223.47/143.20
  6. Step 6: Final answer
    x = 204.07

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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.