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Finding the Fourth Proportional to 66.80, 100.07 and 26.18

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Solution

The fourth proportional to 66.80, 100.07 and 26.18 is: 39.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.80 : 100.07 = 26.18 : x
  2. Step 2: Convert to fraction form
    66.80/100.07 = 26.18/x
  3. Step 3: Cross multiply
    66.80x = 100.07 × 26.18
  4. Step 4: Simplify right side
    66.80x = 2,619.83
  5. Step 5: Solve for x
    x = 2,619.83/66.80
  6. Step 6: Final answer
    x = 39.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.