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Finding the Fourth Proportional to 53.98, 80.95 and 15.45

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Solution

The fourth proportional to 53.98, 80.95 and 15.45 is: 23.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.98 : 80.95 = 15.45 : x
  2. Step 2: Convert to fraction form
    53.98/80.95 = 15.45/x
  3. Step 3: Cross multiply
    53.98x = 80.95 × 15.45
  4. Step 4: Simplify right side
    53.98x = 1,250.68
  5. Step 5: Solve for x
    x = 1,250.68/53.98
  6. Step 6: Final answer
    x = 23.17

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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.