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Finding the Fourth Proportional to 1,078.30, 1,617.99 and 752.95

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Solution

The fourth proportional to 1,078.30, 1,617.99 and 752.95 is: 1,129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.30 : 1,617.99 = 752.95 : x
  2. Step 2: Convert to fraction form
    1,078.30/1,617.99 = 752.95/x
  3. Step 3: Cross multiply
    1,078.30x = 1,617.99 × 752.95
  4. Step 4: Simplify right side
    1,078.30x = 1,218,265.57
  5. Step 5: Solve for x
    x = 1,218,265.57/1,078.30
  6. Step 6: Final answer
    x = 1,129.80

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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.