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Finding the Fourth Proportional to 143.69, 215.61 and 66.69

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Solution

The fourth proportional to 143.69, 215.61 and 66.69 is: 100.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.69 : 215.61 = 66.69 : x
  2. Step 2: Convert to fraction form
    143.69/215.61 = 66.69/x
  3. Step 3: Cross multiply
    143.69x = 215.61 × 66.69
  4. Step 4: Simplify right side
    143.69x = 14,379.16
  5. Step 5: Solve for x
    x = 14,379.16/143.69
  6. Step 6: Final answer
    x = 100.07

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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.