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Finding the Fourth Proportional to 1,144.19, 1,578.97 and 647.00

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Solution

The fourth proportional to 1,144.19, 1,578.97 and 647.00 is: 892.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,144.19 : 1,578.97 = 647.00 : x
  2. Step 2: Convert to fraction form
    1,144.19/1,578.97 = 647.00/x
  3. Step 3: Cross multiply
    1,144.19x = 1,578.97 × 647.00
  4. Step 4: Simplify right side
    1,144.19x = 1,021,585.70
  5. Step 5: Solve for x
    x = 1,021,585.70/1,144.19
  6. Step 6: Final answer
    x = 892.85

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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.