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Finding the Fourth Proportional to 1,679.78, 2,318.90 and 1,121.18

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Solution

The fourth proportional to 1,679.78, 2,318.90 and 1,121.18 is: 1,547.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,679.78 : 2,318.90 = 1,121.18 : x
  2. Step 2: Convert to fraction form
    1,679.78/2,318.90 = 1,121.18/x
  3. Step 3: Cross multiply
    1,679.78x = 2,318.90 × 1,121.18
  4. Step 4: Simplify right side
    1,679.78x = 2,599,904.30
  5. Step 5: Solve for x
    x = 2,599,904.30/1,679.78
  6. Step 6: Final answer
    x = 1,547.76

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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.