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Finding the Fourth Proportional to 67.80, 101.78 and 64.28

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Solution

The fourth proportional to 67.80, 101.78 and 64.28 is: 96.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.80 : 101.78 = 64.28 : x
  2. Step 2: Convert to fraction form
    67.80/101.78 = 64.28/x
  3. Step 3: Cross multiply
    67.80x = 101.78 × 64.28
  4. Step 4: Simplify right side
    67.80x = 6,542.42
  5. Step 5: Solve for x
    x = 6,542.42/67.80
  6. Step 6: Final answer
    x = 96.50

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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.