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Finding the Fourth Proportional to 1,216.68, 1,678.26 and 743.75

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Solution

The fourth proportional to 1,216.68, 1,678.26 and 743.75 is: 1,025.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,216.68 : 1,678.26 = 743.75 : x
  2. Step 2: Convert to fraction form
    1,216.68/1,678.26 = 743.75/x
  3. Step 3: Cross multiply
    1,216.68x = 1,678.26 × 743.75
  4. Step 4: Simplify right side
    1,216.68x = 1,248,209.97
  5. Step 5: Solve for x
    x = 1,248,209.97/1,216.68
  6. Step 6: Final answer
    x = 1,025.92

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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.