Home / 8,658.09-12,989.70-3,111.30

Finding the Fourth Proportional to 8,658.09, 12,989.70 and 3,111.30

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Solution

The fourth proportional to 8,658.09, 12,989.70 and 3,111.30 is: 4,667.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,658.09 : 12,989.70 = 3,111.30 : x
  2. Step 2: Convert to fraction form
    8,658.09/12,989.70 = 3,111.30/x
  3. Step 3: Cross multiply
    8,658.09x = 12,989.70 × 3,111.30
  4. Step 4: Simplify right side
    8,658.09x = 40,414,853.61
  5. Step 5: Solve for x
    x = 40,414,853.61/8,658.09
  6. Step 6: Final answer
    x = 4,667.87

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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.