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Finding the Fourth Proportional to 55.74, 83.52 and 39.48

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Solution

The fourth proportional to 55.74, 83.52 and 39.48 is: 59.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.74 : 83.52 = 39.48 : x
  2. Step 2: Convert to fraction form
    55.74/83.52 = 39.48/x
  3. Step 3: Cross multiply
    55.74x = 83.52 × 39.48
  4. Step 4: Simplify right side
    55.74x = 3,297.37
  5. Step 5: Solve for x
    x = 3,297.37/55.74
  6. Step 6: Final answer
    x = 59.16

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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.