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Finding the Fourth Proportional to 56.39, 77.85 and 45.54

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Solution

The fourth proportional to 56.39, 77.85 and 45.54 is: 62.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.39 : 77.85 = 45.54 : x
  2. Step 2: Convert to fraction form
    56.39/77.85 = 45.54/x
  3. Step 3: Cross multiply
    56.39x = 77.85 × 45.54
  4. Step 4: Simplify right side
    56.39x = 3,545.29
  5. Step 5: Solve for x
    x = 3,545.29/56.39
  6. Step 6: Final answer
    x = 62.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.