Home / 12,811.40-19,217.10-6,979.40

Finding the Fourth Proportional to 12,811.40, 19,217.10 and 6,979.40

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Solution

The fourth proportional to 12,811.40, 19,217.10 and 6,979.40 is: 10,469.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.40 : 19,217.10 = 6,979.40 : x
  2. Step 2: Convert to fraction form
    12,811.40/19,217.10 = 6,979.40/x
  3. Step 3: Cross multiply
    12,811.40x = 19,217.10 × 6,979.40
  4. Step 4: Simplify right side
    12,811.40x = 134,123,827.74
  5. Step 5: Solve for x
    x = 134,123,827.74/12,811.40
  6. Step 6: Final answer
    x = 10,469.10

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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.