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Finding the Fourth Proportional to 8,220.60, 12,330.90 and 7,401.40

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Solution

The fourth proportional to 8,220.60, 12,330.90 and 7,401.40 is: 11,102.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,220.60 : 12,330.90 = 7,401.40 : x
  2. Step 2: Convert to fraction form
    8,220.60/12,330.90 = 7,401.40/x
  3. Step 3: Cross multiply
    8,220.60x = 12,330.90 × 7,401.40
  4. Step 4: Simplify right side
    8,220.60x = 91,265,923.26
  5. Step 5: Solve for x
    x = 91,265,923.26/8,220.60
  6. Step 6: Final answer
    x = 11,102.10

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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.