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Finding the Fourth Proportional to 1,143.43, 1,578.19 and 646.36

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Solution

The fourth proportional to 1,143.43, 1,578.19 and 646.36 is: 892.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.43 : 1,578.19 = 646.36 : x
  2. Step 2: Convert to fraction form
    1,143.43/1,578.19 = 646.36/x
  3. Step 3: Cross multiply
    1,143.43x = 1,578.19 × 646.36
  4. Step 4: Simplify right side
    1,143.43x = 1,020,070.19
  5. Step 5: Solve for x
    x = 1,020,070.19/1,143.43
  6. Step 6: Final answer
    x = 892.12

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Half scale
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Double scale
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1.5x scale

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.