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Finding the Fourth Proportional to 39.10, 53.92 and 29.78

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Solution

The fourth proportional to 39.10, 53.92 and 29.78 is: 41.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.10 : 53.92 = 29.78 : x
  2. Step 2: Convert to fraction form
    39.10/53.92 = 29.78/x
  3. Step 3: Cross multiply
    39.10x = 53.92 × 29.78
  4. Step 4: Simplify right side
    39.10x = 1,605.74
  5. Step 5: Solve for x
    x = 1,605.74/39.10
  6. Step 6: Final answer
    x = 41.07

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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.