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Finding the Fourth Proportional to 56.32, 77.66 and 38.80

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Solution

The fourth proportional to 56.32, 77.66 and 38.80 is: 53.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    56.32 : 77.66 = 38.80 : x
  2. Step 2: Convert to fraction form
    56.32/77.66 = 38.80/x
  3. Step 3: Cross multiply
    56.32x = 77.66 × 38.80
  4. Step 4: Simplify right side
    56.32x = 3,013.21
  5. Step 5: Solve for x
    x = 3,013.21/56.32
  6. Step 6: Final answer
    x = 53.50

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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.