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Finding the Fourth Proportional to 43.17, 65.13 and 42.18

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Solution

The fourth proportional to 43.17, 65.13 and 42.18 is: 63.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.17 : 65.13 = 42.18 : x
  2. Step 2: Convert to fraction form
    43.17/65.13 = 42.18/x
  3. Step 3: Cross multiply
    43.17x = 65.13 × 42.18
  4. Step 4: Simplify right side
    43.17x = 2,747.18
  5. Step 5: Solve for x
    x = 2,747.18/43.17
  6. Step 6: Final answer
    x = 63.64

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.