Home / 11,129.40-16,661.30-8,220.69

Finding the Fourth Proportional to 11,129.40, 16,661.30 and 8,220.69

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Solution

The fourth proportional to 11,129.40, 16,661.30 and 8,220.69 is: 12,306.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,129.40 : 16,661.30 = 8,220.69 : x
  2. Step 2: Convert to fraction form
    11,129.40/16,661.30 = 8,220.69/x
  3. Step 3: Cross multiply
    11,129.40x = 16,661.30 × 8,220.69
  4. Step 4: Simplify right side
    11,129.40x = 136,967,341.19
  5. Step 5: Solve for x
    x = 136,967,341.19/11,129.40
  6. Step 6: Final answer
    x = 12,306.80

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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.