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Finding the Fourth Proportional to 268.48, 402.80 and 131.45

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Solution

The fourth proportional to 268.48, 402.80 and 131.45 is: 197.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.48 : 402.80 = 131.45 : x
  2. Step 2: Convert to fraction form
    268.48/402.80 = 131.45/x
  3. Step 3: Cross multiply
    268.48x = 402.80 × 131.45
  4. Step 4: Simplify right side
    268.48x = 52,948.41
  5. Step 5: Solve for x
    x = 52,948.41/268.48
  6. Step 6: Final answer
    x = 197.22

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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.