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Finding the Fourth Proportional to 909.77, 1,255.84 and 615.90

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Solution

The fourth proportional to 909.77, 1,255.84 and 615.90 is: 850.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.77 : 1,255.84 = 615.90 : x
  2. Step 2: Convert to fraction form
    909.77/1,255.84 = 615.90/x
  3. Step 3: Cross multiply
    909.77x = 1,255.84 × 615.90
  4. Step 4: Simplify right side
    909.77x = 773,475.03
  5. Step 5: Solve for x
    x = 773,475.03/909.77
  6. Step 6: Final answer
    x = 850.19

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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.