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Finding the Fourth Proportional to 55.59, 76.72 and 31.03

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Solution

The fourth proportional to 55.59, 76.72 and 31.03 is: 42.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.59 : 76.72 = 31.03 : x
  2. Step 2: Convert to fraction form
    55.59/76.72 = 31.03/x
  3. Step 3: Cross multiply
    55.59x = 76.72 × 31.03
  4. Step 4: Simplify right side
    55.59x = 2,380.47
  5. Step 5: Solve for x
    x = 2,380.47/55.59
  6. Step 6: Final answer
    x = 42.82

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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.