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Finding the Fourth Proportional to 268.80, 402.84 and 140.28

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Solution

The fourth proportional to 268.80, 402.84 and 140.28 is: 210.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 402.84 = 140.28 : x
  2. Step 2: Convert to fraction form
    268.80/402.84 = 140.28/x
  3. Step 3: Cross multiply
    268.80x = 402.84 × 140.28
  4. Step 4: Simplify right side
    268.80x = 56,510.40
  5. Step 5: Solve for x
    x = 56,510.40/268.80
  6. Step 6: Final answer
    x = 210.23

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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.