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Finding the Fourth Proportional to 296.66, 411.38 and 280.10

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Solution

The fourth proportional to 296.66, 411.38 and 280.10 is: 388.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    296.66 : 411.38 = 280.10 : x
  2. Step 2: Convert to fraction form
    296.66/411.38 = 280.10/x
  3. Step 3: Cross multiply
    296.66x = 411.38 × 280.10
  4. Step 4: Simplify right side
    296.66x = 115,227.54
  5. Step 5: Solve for x
    x = 115,227.54/296.66
  6. Step 6: Final answer
    x = 388.42

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.