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Finding the Fourth Proportional to 42.31, 58.37 and 31.38

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Solution

The fourth proportional to 42.31, 58.37 and 31.38 is: 43.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.31 : 58.37 = 31.38 : x
  2. Step 2: Convert to fraction form
    42.31/58.37 = 31.38/x
  3. Step 3: Cross multiply
    42.31x = 58.37 × 31.38
  4. Step 4: Simplify right side
    42.31x = 1,831.65
  5. Step 5: Solve for x
    x = 1,831.65/42.31
  6. Step 6: Final answer
    x = 43.29

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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.