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Finding the Fourth Proportional to 143.55, 215.30 and 66.48

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Solution

The fourth proportional to 143.55, 215.30 and 66.48 is: 99.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.55 : 215.30 = 66.48 : x
  2. Step 2: Convert to fraction form
    143.55/215.30 = 66.48/x
  3. Step 3: Cross multiply
    143.55x = 215.30 × 66.48
  4. Step 4: Simplify right side
    143.55x = 14,312.81
  5. Step 5: Solve for x
    x = 14,312.81/143.55
  6. Step 6: Final answer
    x = 99.71

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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.