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Finding the Fourth Proportional to 53.65, 80.40 and 29.28

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Solution

The fourth proportional to 53.65, 80.40 and 29.28 is: 43.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.65 : 80.40 = 29.28 : x
  2. Step 2: Convert to fraction form
    53.65/80.40 = 29.28/x
  3. Step 3: Cross multiply
    53.65x = 80.40 × 29.28
  4. Step 4: Simplify right side
    53.65x = 2,354.11
  5. Step 5: Solve for x
    x = 2,354.11/53.65
  6. Step 6: Final answer
    x = 43.88

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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.