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Finding the Fourth Proportional to 57.64, 79.53 and 40.39

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Solution

The fourth proportional to 57.64, 79.53 and 40.39 is: 55.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.64 : 79.53 = 40.39 : x
  2. Step 2: Convert to fraction form
    57.64/79.53 = 40.39/x
  3. Step 3: Cross multiply
    57.64x = 79.53 × 40.39
  4. Step 4: Simplify right side
    57.64x = 3,212.22
  5. Step 5: Solve for x
    x = 3,212.22/57.64
  6. Step 6: Final answer
    x = 55.73

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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.