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Finding the Fourth Proportional to 42.85, 59.16 and 30.61

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Solution

The fourth proportional to 42.85, 59.16 and 30.61 is: 42.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.85 : 59.16 = 30.61 : x
  2. Step 2: Convert to fraction form
    42.85/59.16 = 30.61/x
  3. Step 3: Cross multiply
    42.85x = 59.16 × 30.61
  4. Step 4: Simplify right side
    42.85x = 1,810.89
  5. Step 5: Solve for x
    x = 1,810.89/42.85
  6. Step 6: Final answer
    x = 42.26

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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.