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Finding the Fourth Proportional to 12,219.70, 18,330.15 and 6,387.70

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Solution

The fourth proportional to 12,219.70, 18,330.15 and 6,387.70 is: 9,581.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,219.70 : 18,330.15 = 6,387.70 : x
  2. Step 2: Convert to fraction form
    12,219.70/18,330.15 = 6,387.70/x
  3. Step 3: Cross multiply
    12,219.70x = 18,330.15 × 6,387.70
  4. Step 4: Simplify right side
    12,219.70x = 117,087,499.16
  5. Step 5: Solve for x
    x = 117,087,499.16/12,219.70
  6. Step 6: Final answer
    x = 9,581.86

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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.