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Finding the Fourth Proportional to 1,578.20, 2,368.76 and 798.75

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Solution

The fourth proportional to 1,578.20, 2,368.76 and 798.75 is: 1,198.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.20 : 2,368.76 = 798.75 : x
  2. Step 2: Convert to fraction form
    1,578.20/2,368.76 = 798.75/x
  3. Step 3: Cross multiply
    1,578.20x = 2,368.76 × 798.75
  4. Step 4: Simplify right side
    1,578.20x = 1,892,037.17
  5. Step 5: Solve for x
    x = 1,892,037.17/1,578.20
  6. Step 6: Final answer
    x = 1,198.86

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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.