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Finding the Fourth Proportional to 143.76, 215.64 and 66.72

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Solution

The fourth proportional to 143.76, 215.64 and 66.72 is: 100.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.76 : 215.64 = 66.72 : x
  2. Step 2: Convert to fraction form
    143.76/215.64 = 66.72/x
  3. Step 3: Cross multiply
    143.76x = 215.64 × 66.72
  4. Step 4: Simplify right side
    143.76x = 14,387.50
  5. Step 5: Solve for x
    x = 14,387.50/143.76
  6. Step 6: Final answer
    x = 100.08

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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.