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Finding the Fourth Proportional to 39.10, 54.08 and 34.80

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Solution

The fourth proportional to 39.10, 54.08 and 34.80 is: 48.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.10 : 54.08 = 34.80 : x
  2. Step 2: Convert to fraction form
    39.10/54.08 = 34.80/x
  3. Step 3: Cross multiply
    39.10x = 54.08 × 34.80
  4. Step 4: Simplify right side
    39.10x = 1,881.80
  5. Step 5: Solve for x
    x = 1,881.80/39.10
  6. Step 6: Final answer
    x = 48.13

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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.