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Finding the Fourth Proportional to 909.57, 1,363.68 and 636.15

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Solution

The fourth proportional to 909.57, 1,363.68 and 636.15 is: 953.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.57 : 1,363.68 = 636.15 : x
  2. Step 2: Convert to fraction form
    909.57/1,363.68 = 636.15/x
  3. Step 3: Cross multiply
    909.57x = 1,363.68 × 636.15
  4. Step 4: Simplify right side
    909.57x = 867,505.03
  5. Step 5: Solve for x
    x = 867,505.03/909.57
  6. Step 6: Final answer
    x = 953.75

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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.