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Finding the Fourth Proportional to 909.26, 1,364.10 and 422.20

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Solution

The fourth proportional to 909.26, 1,364.10 and 422.20 is: 633.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.26 : 1,364.10 = 422.20 : x
  2. Step 2: Convert to fraction form
    909.26/1,364.10 = 422.20/x
  3. Step 3: Cross multiply
    909.26x = 1,364.10 × 422.20
  4. Step 4: Simplify right side
    909.26x = 575,923.02
  5. Step 5: Solve for x
    x = 575,923.02/909.26
  6. Step 6: Final answer
    x = 633.40

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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.