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Finding the Fourth Proportional to 922.08, 1,272.56 and 688.80

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Solution

The fourth proportional to 922.08, 1,272.56 and 688.80 is: 950.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    922.08 : 1,272.56 = 688.80 : x
  2. Step 2: Convert to fraction form
    922.08/1,272.56 = 688.80/x
  3. Step 3: Cross multiply
    922.08x = 1,272.56 × 688.80
  4. Step 4: Simplify right side
    922.08x = 876,539.33
  5. Step 5: Solve for x
    x = 876,539.33/922.08
  6. Step 6: Final answer
    x = 950.61

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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.