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Finding the Fourth Proportional to 1,224.62, 1,689.98 and 678.90

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Solution

The fourth proportional to 1,224.62, 1,689.98 and 678.90 is: 936.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.62 : 1,689.98 = 678.90 : x
  2. Step 2: Convert to fraction form
    1,224.62/1,689.98 = 678.90/x
  3. Step 3: Cross multiply
    1,224.62x = 1,689.98 × 678.90
  4. Step 4: Simplify right side
    1,224.62x = 1,147,327.42
  5. Step 5: Solve for x
    x = 1,147,327.42/1,224.62
  6. Step 6: Final answer
    x = 936.88

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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.