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Finding the Fourth Proportional to 55.09, 82.54 and 39.87

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Solution

The fourth proportional to 55.09, 82.54 and 39.87 is: 59.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.09 : 82.54 = 39.87 : x
  2. Step 2: Convert to fraction form
    55.09/82.54 = 39.87/x
  3. Step 3: Cross multiply
    55.09x = 82.54 × 39.87
  4. Step 4: Simplify right side
    55.09x = 3,290.77
  5. Step 5: Solve for x
    x = 3,290.77/55.09
  6. Step 6: Final answer
    x = 59.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.