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Finding the Fourth Proportional to 909.56, 1,364.34 and 422.96

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Solution

The fourth proportional to 909.56, 1,364.34 and 422.96 is: 634.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.56 : 1,364.34 = 422.96 : x
  2. Step 2: Convert to fraction form
    909.56/1,364.34 = 422.96/x
  3. Step 3: Cross multiply
    909.56x = 1,364.34 × 422.96
  4. Step 4: Simplify right side
    909.56x = 577,054.42
  5. Step 5: Solve for x
    x = 577,054.42/909.56
  6. Step 6: Final answer
    x = 634.44

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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.