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Finding the Fourth Proportional to 55.98, 77.28 and 39.66

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Solution

The fourth proportional to 55.98, 77.28 and 39.66 is: 54.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.98 : 77.28 = 39.66 : x
  2. Step 2: Convert to fraction form
    55.98/77.28 = 39.66/x
  3. Step 3: Cross multiply
    55.98x = 77.28 × 39.66
  4. Step 4: Simplify right side
    55.98x = 3,064.92
  5. Step 5: Solve for x
    x = 3,064.92/55.98
  6. Step 6: Final answer
    x = 54.75

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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.