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Finding the Fourth Proportional to 8,270.72, 12,411.20 and 7,420.80

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Solution

The fourth proportional to 8,270.72, 12,411.20 and 7,420.80 is: 11,135.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,270.72 : 12,411.20 = 7,420.80 : x
  2. Step 2: Convert to fraction form
    8,270.72/12,411.20 = 7,420.80/x
  3. Step 3: Cross multiply
    8,270.72x = 12,411.20 × 7,420.80
  4. Step 4: Simplify right side
    8,270.72x = 92,101,032.96
  5. Step 5: Solve for x
    x = 92,101,032.96/8,270.72
  6. Step 6: Final answer
    x = 11,135.79

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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.