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Finding the Fourth Proportional to 268.80, 402.88 and 259.20

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Solution

The fourth proportional to 268.80, 402.88 and 259.20 is: 388.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.80 : 402.88 = 259.20 : x
  2. Step 2: Convert to fraction form
    268.80/402.88 = 259.20/x
  3. Step 3: Cross multiply
    268.80x = 402.88 × 259.20
  4. Step 4: Simplify right side
    268.80x = 104,426.50
  5. Step 5: Solve for x
    x = 104,426.50/268.80
  6. Step 6: Final answer
    x = 388.49

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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.