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Finding the Fourth Proportional to 296.80, 409.20 and 238.48

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Solution

The fourth proportional to 296.80, 409.20 and 238.48 is: 328.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.80 : 409.20 = 238.48 : x
  2. Step 2: Convert to fraction form
    296.80/409.20 = 238.48/x
  3. Step 3: Cross multiply
    296.80x = 409.20 × 238.48
  4. Step 4: Simplify right side
    296.80x = 97,586.02
  5. Step 5: Solve for x
    x = 97,586.02/296.80
  6. Step 6: Final answer
    x = 328.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.