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Finding the Fourth Proportional to 1,643.78, 2,269.25 and 1,269.92

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Solution

The fourth proportional to 1,643.78, 2,269.25 and 1,269.92 is: 1,753.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,643.78 : 2,269.25 = 1,269.92 : x
  2. Step 2: Convert to fraction form
    1,643.78/2,269.25 = 1,269.92/x
  3. Step 3: Cross multiply
    1,643.78x = 2,269.25 × 1,269.92
  4. Step 4: Simplify right side
    1,643.78x = 2,881,765.96
  5. Step 5: Solve for x
    x = 2,881,765.96/1,643.78
  6. Step 6: Final answer
    x = 1,753.13

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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.