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Finding the Fourth Proportional to 1,224.80, 1,687.44 and 929.60

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Solution

The fourth proportional to 1,224.80, 1,687.44 and 929.60 is: 1,280.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.80 : 1,687.44 = 929.60 : x
  2. Step 2: Convert to fraction form
    1,224.80/1,687.44 = 929.60/x
  3. Step 3: Cross multiply
    1,224.80x = 1,687.44 × 929.60
  4. Step 4: Simplify right side
    1,224.80x = 1,568,644.22
  5. Step 5: Solve for x
    x = 1,568,644.22/1,224.80
  6. Step 6: Final answer
    x = 1,280.73

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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.