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Finding the Fourth Proportional to 60.91, 84.06 and 39.06

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Solution

The fourth proportional to 60.91, 84.06 and 39.06 is: 53.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    60.91 : 84.06 = 39.06 : x
  2. Step 2: Convert to fraction form
    60.91/84.06 = 39.06/x
  3. Step 3: Cross multiply
    60.91x = 84.06 × 39.06
  4. Step 4: Simplify right side
    60.91x = 3,283.38
  5. Step 5: Solve for x
    x = 3,283.38/60.91
  6. Step 6: Final answer
    x = 53.91

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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.