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Finding the Fourth Proportional to 59.90, 82.60 and 39.18

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Solution

The fourth proportional to 59.90, 82.60 and 39.18 is: 54.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    59.90 : 82.60 = 39.18 : x
  2. Step 2: Convert to fraction form
    59.90/82.60 = 39.18/x
  3. Step 3: Cross multiply
    59.90x = 82.60 × 39.18
  4. Step 4: Simplify right side
    59.90x = 3,235.66
  5. Step 5: Solve for x
    x = 3,235.66/59.90
  6. Step 6: Final answer
    x = 54.02

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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.