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Finding the Fourth Proportional to 48.64, 66.64 and 42.88

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Solution

The fourth proportional to 48.64, 66.64 and 42.88 is: 58.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.64 : 66.64 = 42.88 : x
  2. Step 2: Convert to fraction form
    48.64/66.64 = 42.88/x
  3. Step 3: Cross multiply
    48.64x = 66.64 × 42.88
  4. Step 4: Simplify right side
    48.64x = 2,857.52
  5. Step 5: Solve for x
    x = 2,857.52/48.64
  6. Step 6: Final answer
    x = 58.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.