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Finding the Fourth Proportional to 55.75, 76.88 and 42.61

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Solution

The fourth proportional to 55.75, 76.88 and 42.61 is: 58.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.75 : 76.88 = 42.61 : x
  2. Step 2: Convert to fraction form
    55.75/76.88 = 42.61/x
  3. Step 3: Cross multiply
    55.75x = 76.88 × 42.61
  4. Step 4: Simplify right side
    55.75x = 3,275.84
  5. Step 5: Solve for x
    x = 3,275.84/55.75
  6. Step 6: Final answer
    x = 58.76

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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.