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Finding the Fourth Proportional to 61.67, 85.13 and 56.81

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Solution

The fourth proportional to 61.67, 85.13 and 56.81 is: 78.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.67 : 85.13 = 56.81 : x
  2. Step 2: Convert to fraction form
    61.67/85.13 = 56.81/x
  3. Step 3: Cross multiply
    61.67x = 85.13 × 56.81
  4. Step 4: Simplify right side
    61.67x = 4,836.24
  5. Step 5: Solve for x
    x = 4,836.24/61.67
  6. Step 6: Final answer
    x = 78.42

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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.