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Finding the Fourth Proportional to 42.75, 63.90 and 35.10

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Solution

The fourth proportional to 42.75, 63.90 and 35.10 is: 52.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.75 : 63.90 = 35.10 : x
  2. Step 2: Convert to fraction form
    42.75/63.90 = 35.10/x
  3. Step 3: Cross multiply
    42.75x = 63.90 × 35.10
  4. Step 4: Simplify right side
    42.75x = 2,242.89
  5. Step 5: Solve for x
    x = 2,242.89/42.75
  6. Step 6: Final answer
    x = 52.47

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.