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Finding the Fourth Proportional to 73.20, 100.40 and 69.28

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Solution

The fourth proportional to 73.20, 100.40 and 69.28 is: 95.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.20 : 100.40 = 69.28 : x
  2. Step 2: Convert to fraction form
    73.20/100.40 = 69.28/x
  3. Step 3: Cross multiply
    73.20x = 100.40 × 69.28
  4. Step 4: Simplify right side
    73.20x = 6,955.71
  5. Step 5: Solve for x
    x = 6,955.71/73.20
  6. Step 6: Final answer
    x = 95.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.