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Finding the Fourth Proportional to 55.78, 83.60 and 31.66

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Solution

The fourth proportional to 55.78, 83.60 and 31.66 is: 47.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.78 : 83.60 = 31.66 : x
  2. Step 2: Convert to fraction form
    55.78/83.60 = 31.66/x
  3. Step 3: Cross multiply
    55.78x = 83.60 × 31.66
  4. Step 4: Simplify right side
    55.78x = 2,646.20
  5. Step 5: Solve for x
    x = 2,646.20/55.78
  6. Step 6: Final answer
    x = 47.44

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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.