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Finding the Fourth Proportional to 57.44, 79.28 and 40.32

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Solution

The fourth proportional to 57.44, 79.28 and 40.32 is: 55.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.44 : 79.28 = 40.32 : x
  2. Step 2: Convert to fraction form
    57.44/79.28 = 40.32/x
  3. Step 3: Cross multiply
    57.44x = 79.28 × 40.32
  4. Step 4: Simplify right side
    57.44x = 3,196.57
  5. Step 5: Solve for x
    x = 3,196.57/57.44
  6. Step 6: Final answer
    x = 55.65

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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.