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Finding the Fourth Proportional to 909.38, 1,363.57 and 421.97

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Solution

The fourth proportional to 909.38, 1,363.57 and 421.97 is: 632.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.38 : 1,363.57 = 421.97 : x
  2. Step 2: Convert to fraction form
    909.38/1,363.57 = 421.97/x
  3. Step 3: Cross multiply
    909.38x = 1,363.57 × 421.97
  4. Step 4: Simplify right side
    909.38x = 575,377.76
  5. Step 5: Solve for x
    x = 575,377.76/909.38
  6. Step 6: Final answer
    x = 632.71

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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.