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Finding the Fourth Proportional to 57.38, 79.18 and 31.50

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Solution

The fourth proportional to 57.38, 79.18 and 31.50 is: 43.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.38 : 79.18 = 31.50 : x
  2. Step 2: Convert to fraction form
    57.38/79.18 = 31.50/x
  3. Step 3: Cross multiply
    57.38x = 79.18 × 31.50
  4. Step 4: Simplify right side
    57.38x = 2,494.09
  5. Step 5: Solve for x
    x = 2,494.09/57.38
  6. Step 6: Final answer
    x = 43.47

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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.