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Finding the Fourth Proportional to 8,111.40, 12,167.10 and 7,139.40

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Solution

The fourth proportional to 8,111.40, 12,167.10 and 7,139.40 is: 10,709.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,111.40 : 12,167.10 = 7,139.40 : x
  2. Step 2: Convert to fraction form
    8,111.40/12,167.10 = 7,139.40/x
  3. Step 3: Cross multiply
    8,111.40x = 12,167.10 × 7,139.40
  4. Step 4: Simplify right side
    8,111.40x = 86,865,793.74
  5. Step 5: Solve for x
    x = 86,865,793.74/8,111.40
  6. Step 6: Final answer
    x = 10,709.10

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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.