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Finding the Fourth Proportional to 3,186.60, 4,779.90 and 3,143.40

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Solution

The fourth proportional to 3,186.60, 4,779.90 and 3,143.40 is: 4,715.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,186.60 : 4,779.90 = 3,143.40 : x
  2. Step 2: Convert to fraction form
    3,186.60/4,779.90 = 3,143.40/x
  3. Step 3: Cross multiply
    3,186.60x = 4,779.90 × 3,143.40
  4. Step 4: Simplify right side
    3,186.60x = 15,025,137.66
  5. Step 5: Solve for x
    x = 15,025,137.66/3,186.60
  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.