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Finding the Fourth Proportional to 65.49, 98.18 and 42.71

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Solution

The fourth proportional to 65.49, 98.18 and 42.71 is: 64.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    65.49 : 98.18 = 42.71 : x
  2. Step 2: Convert to fraction form
    65.49/98.18 = 42.71/x
  3. Step 3: Cross multiply
    65.49x = 98.18 × 42.71
  4. Step 4: Simplify right side
    65.49x = 4,193.05
  5. Step 5: Solve for x
    x = 4,193.05/65.49
  6. Step 6: Final answer
    x = 64.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.