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Finding the Fourth Proportional to 61.40, 85.18 and 59.18

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Solution

The fourth proportional to 61.40, 85.18 and 59.18 is: 82.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    61.40 : 85.18 = 59.18 : x
  2. Step 2: Convert to fraction form
    61.40/85.18 = 59.18/x
  3. Step 3: Cross multiply
    61.40x = 85.18 × 59.18
  4. Step 4: Simplify right side
    61.40x = 5,040.38
  5. Step 5: Solve for x
    x = 5,040.38/61.40
  6. Step 6: Final answer
    x = 82.09

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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.