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Finding the Fourth Proportional to 53.91, 80.28 and 51.57

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Solution

The fourth proportional to 53.91, 80.28 and 51.57 is: 76.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.91 : 80.28 = 51.57 : x
  2. Step 2: Convert to fraction form
    53.91/80.28 = 51.57/x
  3. Step 3: Cross multiply
    53.91x = 80.28 × 51.57
  4. Step 4: Simplify right side
    53.91x = 4,139.51
  5. Step 5: Solve for x
    x = 4,139.51/53.91
  6. Step 6: Final answer
    x = 76.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.