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Finding the Fourth Proportional to 61.56, 85.40 and 61.04

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Solution

The fourth proportional to 61.56, 85.40 and 61.04 is: 84.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.56 : 85.40 = 61.04 : x
  2. Step 2: Convert to fraction form
    61.56/85.40 = 61.04/x
  3. Step 3: Cross multiply
    61.56x = 85.40 × 61.04
  4. Step 4: Simplify right side
    61.56x = 5,212.82
  5. Step 5: Solve for x
    x = 5,212.82/61.56
  6. Step 6: Final answer
    x = 84.68

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.