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Finding the Fourth Proportional to 909.60, 1,255.86 and 699.40

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Solution

The fourth proportional to 909.60, 1,255.86 and 699.40 is: 965.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.60 : 1,255.86 = 699.40 : x
  2. Step 2: Convert to fraction form
    909.60/1,255.86 = 699.40/x
  3. Step 3: Cross multiply
    909.60x = 1,255.86 × 699.40
  4. Step 4: Simplify right side
    909.60x = 878,348.48
  5. Step 5: Solve for x
    x = 878,348.48/909.60
  6. Step 6: Final answer
    x = 965.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.