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Finding the Fourth Proportional to 1,578.71, 2,176.74 and 1,081.78

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Solution

The fourth proportional to 1,578.71, 2,176.74 and 1,081.78 is: 1,491.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.71 : 2,176.74 = 1,081.78 : x
  2. Step 2: Convert to fraction form
    1,578.71/2,176.74 = 1,081.78/x
  3. Step 3: Cross multiply
    1,578.71x = 2,176.74 × 1,081.78
  4. Step 4: Simplify right side
    1,578.71x = 2,354,748.36
  5. Step 5: Solve for x
    x = 2,354,748.36/1,578.71
  6. Step 6: Final answer
    x = 1,491.56

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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.