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Finding the Fourth Proportional to 855.38, 1,281.55 and 580.49

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Solution

The fourth proportional to 855.38, 1,281.55 and 580.49 is: 869.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.38 : 1,281.55 = 580.49 : x
  2. Step 2: Convert to fraction form
    855.38/1,281.55 = 580.49/x
  3. Step 3: Cross multiply
    855.38x = 1,281.55 × 580.49
  4. Step 4: Simplify right side
    855.38x = 743,920.69
  5. Step 5: Solve for x
    x = 743,920.69/855.38
  6. Step 6: Final answer
    x = 869.70

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1.5x scale

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.