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Finding the Fourth Proportional to 8,118.40, 12,170.40 and 3,186.40

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Solution

The fourth proportional to 8,118.40, 12,170.40 and 3,186.40 is: 4,776.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,118.40 : 12,170.40 = 3,186.40 : x
  2. Step 2: Convert to fraction form
    8,118.40/12,170.40 = 3,186.40/x
  3. Step 3: Cross multiply
    8,118.40x = 12,170.40 × 3,186.40
  4. Step 4: Simplify right side
    8,118.40x = 38,779,762.56
  5. Step 5: Solve for x
    x = 38,779,762.56/8,118.40
  6. Step 6: Final answer
    x = 4,776.77

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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.