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Finding the Fourth Proportional to 42.29, 58.32 and 40.12

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Solution

The fourth proportional to 42.29, 58.32 and 40.12 is: 55.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.29 : 58.32 = 40.12 : x
  2. Step 2: Convert to fraction form
    42.29/58.32 = 40.12/x
  3. Step 3: Cross multiply
    42.29x = 58.32 × 40.12
  4. Step 4: Simplify right side
    42.29x = 2,339.60
  5. Step 5: Solve for x
    x = 2,339.60/42.29
  6. Step 6: Final answer
    x = 55.32

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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.