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Finding the Fourth Proportional to 1,143.90, 1,578.56 and 646.53

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Solution

The fourth proportional to 1,143.90, 1,578.56 and 646.53 is: 892.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.90 : 1,578.56 = 646.53 : x
  2. Step 2: Convert to fraction form
    1,143.90/1,578.56 = 646.53/x
  3. Step 3: Cross multiply
    1,143.90x = 1,578.56 × 646.53
  4. Step 4: Simplify right side
    1,143.90x = 1,020,591.58
  5. Step 5: Solve for x
    x = 1,020,591.58/1,143.90
  6. Step 6: Final answer
    x = 892.21

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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.