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Finding the Fourth Proportional to 53.70, 80.50 and 42.88

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Solution

The fourth proportional to 53.70, 80.50 and 42.88 is: 64.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    53.70 : 80.50 = 42.88 : x
  2. Step 2: Convert to fraction form
    53.70/80.50 = 42.88/x
  3. Step 3: Cross multiply
    53.70x = 80.50 × 42.88
  4. Step 4: Simplify right side
    53.70x = 3,451.84
  5. Step 5: Solve for x
    x = 3,451.84/53.70
  6. Step 6: Final answer
    x = 64.28

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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.