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Finding the Fourth Proportional to 1,143.47, 1,578.02 and 646.18

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Solution

The fourth proportional to 1,143.47, 1,578.02 and 646.18 is: 891.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.47 : 1,578.02 = 646.18 : x
  2. Step 2: Convert to fraction form
    1,143.47/1,578.02 = 646.18/x
  3. Step 3: Cross multiply
    1,143.47x = 1,578.02 × 646.18
  4. Step 4: Simplify right side
    1,143.47x = 1,019,683.24
  5. Step 5: Solve for x
    x = 1,019,683.24/1,143.47
  6. Step 6: Final answer
    x = 891.75

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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.