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Finding the Fourth Proportional to 44.64, 61.72 and 39.88

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Solution

The fourth proportional to 44.64, 61.72 and 39.88 is: 55.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.64 : 61.72 = 39.88 : x
  2. Step 2: Convert to fraction form
    44.64/61.72 = 39.88/x
  3. Step 3: Cross multiply
    44.64x = 61.72 × 39.88
  4. Step 4: Simplify right side
    44.64x = 2,461.39
  5. Step 5: Solve for x
    x = 2,461.39/44.64
  6. Step 6: Final answer
    x = 55.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.