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Finding the Fourth Proportional to 53.78, 80.61 and 21.74

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Solution

The fourth proportional to 53.78, 80.61 and 21.74 is: 32.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.78 : 80.61 = 21.74 : x
  2. Step 2: Convert to fraction form
    53.78/80.61 = 21.74/x
  3. Step 3: Cross multiply
    53.78x = 80.61 × 21.74
  4. Step 4: Simplify right side
    53.78x = 1,752.46
  5. Step 5: Solve for x
    x = 1,752.46/53.78
  6. Step 6: Final answer
    x = 32.59

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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.