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Finding the Fourth Proportional to 3,909.92, 5,866.78 and 1,718.36

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Solution

The fourth proportional to 3,909.92, 5,866.78 and 1,718.36 is: 2,578.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.92 : 5,866.78 = 1,718.36 : x
  2. Step 2: Convert to fraction form
    3,909.92/5,866.78 = 1,718.36/x
  3. Step 3: Cross multiply
    3,909.92x = 5,866.78 × 1,718.36
  4. Step 4: Simplify right side
    3,909.92x = 10,081,264.67
  5. Step 5: Solve for x
    x = 10,081,264.67/3,909.92
  6. Step 6: Final answer
    x = 2,578.38

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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.