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Finding the Fourth Proportional to 6,622.70, 9,920.21 and 3,115.67

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Solution

The fourth proportional to 6,622.70, 9,920.21 and 3,115.67 is: 4,666.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,622.70 : 9,920.21 = 3,115.67 : x
  2. Step 2: Convert to fraction form
    6,622.70/9,920.21 = 3,115.67/x
  3. Step 3: Cross multiply
    6,622.70x = 9,920.21 × 3,115.67
  4. Step 4: Simplify right side
    6,622.70x = 30,908,035.51
  5. Step 5: Solve for x
    x = 30,908,035.51/6,622.70
  6. Step 6: Final answer
    x = 4,666.99

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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.