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Finding the Fourth Proportional to 909.56, 1,255.36 and 688.13

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Solution

The fourth proportional to 909.56, 1,255.36 and 688.13 is: 949.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.56 : 1,255.36 = 688.13 : x
  2. Step 2: Convert to fraction form
    909.56/1,255.36 = 688.13/x
  3. Step 3: Cross multiply
    909.56x = 1,255.36 × 688.13
  4. Step 4: Simplify right side
    909.56x = 863,846.94
  5. Step 5: Solve for x
    x = 863,846.94/909.56
  6. Step 6: Final answer
    x = 949.74

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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.