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Finding the Fourth Proportional to 45.68, 62.88 and 42.64

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Solution

The fourth proportional to 45.68, 62.88 and 42.64 is: 58.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.68 : 62.88 = 42.64 : x
  2. Step 2: Convert to fraction form
    45.68/62.88 = 42.64/x
  3. Step 3: Cross multiply
    45.68x = 62.88 × 42.64
  4. Step 4: Simplify right side
    45.68x = 2,681.20
  5. Step 5: Solve for x
    x = 2,681.20/45.68
  6. Step 6: Final answer
    x = 58.70

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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.