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Finding the Fourth Proportional to 854.28, 1,280.95 and 489.34

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Solution

The fourth proportional to 854.28, 1,280.95 and 489.34 is: 733.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.28 : 1,280.95 = 489.34 : x
  2. Step 2: Convert to fraction form
    854.28/1,280.95 = 489.34/x
  3. Step 3: Cross multiply
    854.28x = 1,280.95 × 489.34
  4. Step 4: Simplify right side
    854.28x = 626,820.45
  5. Step 5: Solve for x
    x = 626,820.45/854.28
  6. Step 6: Final answer
    x = 733.74

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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.