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Finding the Fourth Proportional to 42.64, 64.30 and 41.92

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Solution

The fourth proportional to 42.64, 64.30 and 41.92 is: 63.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.64 : 64.30 = 41.92 : x
  2. Step 2: Convert to fraction form
    42.64/64.30 = 41.92/x
  3. Step 3: Cross multiply
    42.64x = 64.30 × 41.92
  4. Step 4: Simplify right side
    42.64x = 2,695.46
  5. Step 5: Solve for x
    x = 2,695.46/42.64
  6. Step 6: Final answer
    x = 63.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.