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Finding the Fourth Proportional to 66.65, 99.89 and 26.04

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Solution

The fourth proportional to 66.65, 99.89 and 26.04 is: 39.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.65 : 99.89 = 26.04 : x
  2. Step 2: Convert to fraction form
    66.65/99.89 = 26.04/x
  3. Step 3: Cross multiply
    66.65x = 99.89 × 26.04
  4. Step 4: Simplify right side
    66.65x = 2,601.20
  5. Step 5: Solve for x
    x = 2,601.20/66.65
  6. Step 6: Final answer
    x = 39.03

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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.