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Finding the Fourth Proportional to 854.42, 1,280.34 and 489.31

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Solution

The fourth proportional to 854.42, 1,280.34 and 489.31 is: 733.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.42 : 1,280.34 = 489.31 : x
  2. Step 2: Convert to fraction form
    854.42/1,280.34 = 489.31/x
  3. Step 3: Cross multiply
    854.42x = 1,280.34 × 489.31
  4. Step 4: Simplify right side
    854.42x = 626,479.96
  5. Step 5: Solve for x
    x = 626,479.96/854.42
  6. Step 6: Final answer
    x = 733.23

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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.