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Finding the Fourth Proportional to 828.91, 1,242.98 and 280.95

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Solution

The fourth proportional to 828.91, 1,242.98 and 280.95 is: 421.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    828.91 : 1,242.98 = 280.95 : x
  2. Step 2: Convert to fraction form
    828.91/1,242.98 = 280.95/x
  3. Step 3: Cross multiply
    828.91x = 1,242.98 × 280.95
  4. Step 4: Simplify right side
    828.91x = 349,210.22
  5. Step 5: Solve for x
    x = 349,210.22/828.91
  6. Step 6: Final answer
    x = 421.29

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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.