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Finding the Fourth Proportional to 42.30, 58.29 and 31.37

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Solution

The fourth proportional to 42.30, 58.29 and 31.37 is: 43.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.30 : 58.29 = 31.37 : x
  2. Step 2: Convert to fraction form
    42.30/58.29 = 31.37/x
  3. Step 3: Cross multiply
    42.30x = 58.29 × 31.37
  4. Step 4: Simplify right side
    42.30x = 1,828.27
  5. Step 5: Solve for x
    x = 1,828.27/42.30
  6. Step 6: Final answer
    x = 43.22

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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.