Home / 11,420.80-15,755.72-6,640.38

Finding the Fourth Proportional to 11,420.80, 15,755.72 and 6,640.38

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Solution

The fourth proportional to 11,420.80, 15,755.72 and 6,640.38 is: 9,160.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,420.80 : 15,755.72 = 6,640.38 : x
  2. Step 2: Convert to fraction form
    11,420.80/15,755.72 = 6,640.38/x
  3. Step 3: Cross multiply
    11,420.80x = 15,755.72 × 6,640.38
  4. Step 4: Simplify right side
    11,420.80x = 104,623,934.77
  5. Step 5: Solve for x
    x = 104,623,934.77/11,420.80
  6. Step 6: Final answer
    x = 9,160.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.