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Finding the Fourth Proportional to 1,143.88, 1,578.46 and 646.56

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Solution

The fourth proportional to 1,143.88, 1,578.46 and 646.56 is: 892.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.88 : 1,578.46 = 646.56 : x
  2. Step 2: Convert to fraction form
    1,143.88/1,578.46 = 646.56/x
  3. Step 3: Cross multiply
    1,143.88x = 1,578.46 × 646.56
  4. Step 4: Simplify right side
    1,143.88x = 1,020,569.10
  5. Step 5: Solve for x
    x = 1,020,569.10/1,143.88
  6. Step 6: Final answer
    x = 892.20

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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.