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Finding the Fourth Proportional to 45.56, 67.92 and 43.40

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Solution

The fourth proportional to 45.56, 67.92 and 43.40 is: 64.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.56 : 67.92 = 43.40 : x
  2. Step 2: Convert to fraction form
    45.56/67.92 = 43.40/x
  3. Step 3: Cross multiply
    45.56x = 67.92 × 43.40
  4. Step 4: Simplify right side
    45.56x = 2,947.73
  5. Step 5: Solve for x
    x = 2,947.73/45.56
  6. Step 6: Final answer
    x = 64.70

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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.