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Finding the Fourth Proportional to 61.10, 91.19 and 56.87

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Solution

The fourth proportional to 61.10, 91.19 and 56.87 is: 84.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.10 : 91.19 = 56.87 : x
  2. Step 2: Convert to fraction form
    61.10/91.19 = 56.87/x
  3. Step 3: Cross multiply
    61.10x = 91.19 × 56.87
  4. Step 4: Simplify right side
    61.10x = 5,186.00
  5. Step 5: Solve for x
    x = 5,186.00/61.10
  6. Step 6: Final answer
    x = 84.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.