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Finding the Fourth Proportional to 45.45, 67.80 and 42.71

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Solution

The fourth proportional to 45.45, 67.80 and 42.71 is: 63.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.45 : 67.80 = 42.71 : x
  2. Step 2: Convert to fraction form
    45.45/67.80 = 42.71/x
  3. Step 3: Cross multiply
    45.45x = 67.80 × 42.71
  4. Step 4: Simplify right side
    45.45x = 2,895.40
  5. Step 5: Solve for x
    x = 2,895.40/45.45
  6. Step 6: Final answer
    x = 63.71

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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.