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Finding the Fourth Proportional to 7,120.85, 9,825.11 and 4,134.89

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Solution

The fourth proportional to 7,120.85, 9,825.11 and 4,134.89 is: 5,705.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,120.85 : 9,825.11 = 4,134.89 : x
  2. Step 2: Convert to fraction form
    7,120.85/9,825.11 = 4,134.89/x
  3. Step 3: Cross multiply
    7,120.85x = 9,825.11 × 4,134.89
  4. Step 4: Simplify right side
    7,120.85x = 40,625,679.29
  5. Step 5: Solve for x
    x = 40,625,679.29/7,120.85
  6. Step 6: Final answer
    x = 5,705.18

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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.