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Finding the Fourth Proportional to 855.03, 1,282.55 and 489.57

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Solution

The fourth proportional to 855.03, 1,282.55 and 489.57 is: 734.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.03 : 1,282.55 = 489.57 : x
  2. Step 2: Convert to fraction form
    855.03/1,282.55 = 489.57/x
  3. Step 3: Cross multiply
    855.03x = 1,282.55 × 489.57
  4. Step 4: Simplify right side
    855.03x = 627,894.19
  5. Step 5: Solve for x
    x = 627,894.19/855.03
  6. Step 6: Final answer
    x = 734.35

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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.