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Finding the Fourth Proportional to 909.24, 1,256.08 and 615.80

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Solution

The fourth proportional to 909.24, 1,256.08 and 615.80 is: 850.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.24 : 1,256.08 = 615.80 : x
  2. Step 2: Convert to fraction form
    909.24/1,256.08 = 615.80/x
  3. Step 3: Cross multiply
    909.24x = 1,256.08 × 615.80
  4. Step 4: Simplify right side
    909.24x = 773,494.06
  5. Step 5: Solve for x
    x = 773,494.06/909.24
  6. Step 6: Final answer
    x = 850.70

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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.