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Finding the Fourth Proportional to 855.41, 1,281.29 and 489.29

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Solution

The fourth proportional to 855.41, 1,281.29 and 489.29 is: 732.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.41 : 1,281.29 = 489.29 : x
  2. Step 2: Convert to fraction form
    855.41/1,281.29 = 489.29/x
  3. Step 3: Cross multiply
    855.41x = 1,281.29 × 489.29
  4. Step 4: Simplify right side
    855.41x = 626,913.53
  5. Step 5: Solve for x
    x = 626,913.53/855.41
  6. Step 6: Final answer
    x = 732.89

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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.