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Finding the Fourth Proportional to 43.19, 64.29 and 42.96

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Solution

The fourth proportional to 43.19, 64.29 and 42.96 is: 63.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.19 : 64.29 = 42.96 : x
  2. Step 2: Convert to fraction form
    43.19/64.29 = 42.96/x
  3. Step 3: Cross multiply
    43.19x = 64.29 × 42.96
  4. Step 4: Simplify right side
    43.19x = 2,761.90
  5. Step 5: Solve for x
    x = 2,761.90/43.19
  6. Step 6: Final answer
    x = 63.95

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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.