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Finding the Fourth Proportional to 7,121.70, 10,682.55 and 6,603.30

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Solution

The fourth proportional to 7,121.70, 10,682.55 and 6,603.30 is: 9,904.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,121.70 : 10,682.55 = 6,603.30 : x
  2. Step 2: Convert to fraction form
    7,121.70/10,682.55 = 6,603.30/x
  3. Step 3: Cross multiply
    7,121.70x = 10,682.55 × 6,603.30
  4. Step 4: Simplify right side
    7,121.70x = 70,540,082.42
  5. Step 5: Solve for x
    x = 70,540,082.42/7,121.70
  6. Step 6: Final answer
    x = 9,904.95

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Similar ratio
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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.