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Finding the Fourth Proportional to 2,569.98, 3,854.78 and 721

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Solution

The fourth proportional to 2,569.98, 3,854.78 and 721 is: 1,081.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,569.98 : 3,854.78 = 721 : x
  2. Step 2: Convert to fraction form
    2,569.98/3,854.78 = 721/x
  3. Step 3: Cross multiply
    2,569.98x = 3,854.78 × 721
  4. Step 4: Simplify right side
    2,569.98x = 2,779,296.38
  5. Step 5: Solve for x
    x = 2,779,296.38/2,569.98
  6. Step 6: Final answer
    x = 1,081.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.