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Finding the Fourth Proportional to 42.96, 64.14 and 38.28

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Solution

The fourth proportional to 42.96, 64.14 and 38.28 is: 57.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.96 : 64.14 = 38.28 : x
  2. Step 2: Convert to fraction form
    42.96/64.14 = 38.28/x
  3. Step 3: Cross multiply
    42.96x = 64.14 × 38.28
  4. Step 4: Simplify right side
    42.96x = 2,455.28
  5. Step 5: Solve for x
    x = 2,455.28/42.96
  6. Step 6: Final answer
    x = 57.15

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.