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Finding the Fourth Proportional to 3,618.60, 5,427.90 and 3,143.40

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Solution

The fourth proportional to 3,618.60, 5,427.90 and 3,143.40 is: 4,715.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,618.60 : 5,427.90 = 3,143.40 : x
  2. Step 2: Convert to fraction form
    3,618.60/5,427.90 = 3,143.40/x
  3. Step 3: Cross multiply
    3,618.60x = 5,427.90 × 3,143.40
  4. Step 4: Simplify right side
    3,618.60x = 17,062,060.86
  5. Step 5: Solve for x
    x = 17,062,060.86/3,618.60
  6. Step 6: Final answer
    x = 4,715.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.