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Finding the Fourth Proportional to 280.75, 387.48 and 268.45

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Solution

The fourth proportional to 280.75, 387.48 and 268.45 is: 370.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    280.75 : 387.48 = 268.45 : x
  2. Step 2: Convert to fraction form
    280.75/387.48 = 268.45/x
  3. Step 3: Cross multiply
    280.75x = 387.48 × 268.45
  4. Step 4: Simplify right side
    280.75x = 104,017.66
  5. Step 5: Solve for x
    x = 104,017.66/280.75
  6. Step 6: Final answer
    x = 370.50

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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.