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Finding the Fourth Proportional to 61.95, 85.10 and 55.48

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Solution

The fourth proportional to 61.95, 85.10 and 55.48 is: 76.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.95 : 85.10 = 55.48 : x
  2. Step 2: Convert to fraction form
    61.95/85.10 = 55.48/x
  3. Step 3: Cross multiply
    61.95x = 85.10 × 55.48
  4. Step 4: Simplify right side
    61.95x = 4,720.92
  5. Step 5: Solve for x
    x = 4,720.92/61.95
  6. Step 6: Final answer
    x = 76.21

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.