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Finding the Fourth Proportional to 909.54, 1,255.54 and 688.56

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Solution

The fourth proportional to 909.54, 1,255.54 and 688.56 is: 950.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    909.54 : 1,255.54 = 688.56 : x
  2. Step 2: Convert to fraction form
    909.54/1,255.54 = 688.56/x
  3. Step 3: Cross multiply
    909.54x = 1,255.54 × 688.56
  4. Step 4: Simplify right side
    909.54x = 864,514.62
  5. Step 5: Solve for x
    x = 864,514.62/909.54
  6. Step 6: Final answer
    x = 950.50

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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.