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Finding the Fourth Proportional to 855.49, 1,281.17 and 489.16

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Solution

The fourth proportional to 855.49, 1,281.17 and 489.16 is: 732.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.49 : 1,281.17 = 489.16 : x
  2. Step 2: Convert to fraction form
    855.49/1,281.17 = 489.16/x
  3. Step 3: Cross multiply
    855.49x = 1,281.17 × 489.16
  4. Step 4: Simplify right side
    855.49x = 626,700.79
  5. Step 5: Solve for x
    x = 626,700.79/855.49
  6. Step 6: Final answer
    x = 732.57

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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.