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Finding the Fourth Proportional to 143.47, 215.20 and 66.43

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Solution

The fourth proportional to 143.47, 215.20 and 66.43 is: 99.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.47 : 215.20 = 66.43 : x
  2. Step 2: Convert to fraction form
    143.47/215.20 = 66.43/x
  3. Step 3: Cross multiply
    143.47x = 215.20 × 66.43
  4. Step 4: Simplify right side
    143.47x = 14,295.74
  5. Step 5: Solve for x
    x = 14,295.74/143.47
  6. Step 6: Final answer
    x = 99.64

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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.