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Finding the Fourth Proportional to 55.60, 76.56 and 39.20

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Solution

The fourth proportional to 55.60, 76.56 and 39.20 is: 53.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.60 : 76.56 = 39.20 : x
  2. Step 2: Convert to fraction form
    55.60/76.56 = 39.20/x
  3. Step 3: Cross multiply
    55.60x = 76.56 × 39.20
  4. Step 4: Simplify right side
    55.60x = 3,001.15
  5. Step 5: Solve for x
    x = 3,001.15/55.60
  6. Step 6: Final answer
    x = 53.98

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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.