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Finding the Fourth Proportional to 143.74, 215.66 and 66.69

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Solution

The fourth proportional to 143.74, 215.66 and 66.69 is: 100.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.74 : 215.66 = 66.69 : x
  2. Step 2: Convert to fraction form
    143.74/215.66 = 66.69/x
  3. Step 3: Cross multiply
    143.74x = 215.66 × 66.69
  4. Step 4: Simplify right side
    143.74x = 14,382.53
  5. Step 5: Solve for x
    x = 14,382.53/143.74
  6. Step 6: Final answer
    x = 100.06

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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.