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Finding the Fourth Proportional to 7,726, 10,661.88 and 4,189.20

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Solution

The fourth proportional to 7,726, 10,661.88 and 4,189.20 is: 5,781.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,726 : 10,661.88 = 4,189.20 : x
  2. Step 2: Convert to fraction form
    7,726/10,661.88 = 4,189.20/x
  3. Step 3: Cross multiply
    7,726x = 10,661.88 × 4,189.20
  4. Step 4: Simplify right side
    7,726x = 44,664,747.70
  5. Step 5: Solve for x
    x = 44,664,747.70/7,726
  6. Step 6: Final answer
    x = 5,781.10

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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.