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Finding the Fourth Proportional to 42.18, 58.08 and 39.26

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Solution

The fourth proportional to 42.18, 58.08 and 39.26 is: 54.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.18 : 58.08 = 39.26 : x
  2. Step 2: Convert to fraction form
    42.18/58.08 = 39.26/x
  3. Step 3: Cross multiply
    42.18x = 58.08 × 39.26
  4. Step 4: Simplify right side
    42.18x = 2,280.22
  5. Step 5: Solve for x
    x = 2,280.22/42.18
  6. Step 6: Final answer
    x = 54.06

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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.