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Finding the Fourth Proportional to 280.50, 387.13 and 268.20

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Solution

The fourth proportional to 280.50, 387.13 and 268.20 is: 370.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.50 : 387.13 = 268.20 : x
  2. Step 2: Convert to fraction form
    280.50/387.13 = 268.20/x
  3. Step 3: Cross multiply
    280.50x = 387.13 × 268.20
  4. Step 4: Simplify right side
    280.50x = 103,828.27
  5. Step 5: Solve for x
    x = 103,828.27/280.50
  6. Step 6: Final answer
    x = 370.15

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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.