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Finding the Fourth Proportional to 53.65, 80.40 and 26.57

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Solution

The fourth proportional to 53.65, 80.40 and 26.57 is: 39.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.65 : 80.40 = 26.57 : x
  2. Step 2: Convert to fraction form
    53.65/80.40 = 26.57/x
  3. Step 3: Cross multiply
    53.65x = 80.40 × 26.57
  4. Step 4: Simplify right side
    53.65x = 2,135.73
  5. Step 5: Solve for x
    x = 2,135.73/53.65
  6. Step 6: Final answer
    x = 39.81

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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.