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Finding the Fourth Proportional to 66.96, 100.40 and 26.35

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Solution

The fourth proportional to 66.96, 100.40 and 26.35 is: 39.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.96 : 100.40 = 26.35 : x
  2. Step 2: Convert to fraction form
    66.96/100.40 = 26.35/x
  3. Step 3: Cross multiply
    66.96x = 100.40 × 26.35
  4. Step 4: Simplify right side
    66.96x = 2,645.16
  5. Step 5: Solve for x
    x = 2,645.16/66.96
  6. Step 6: Final answer
    x = 39.50

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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.