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Finding the Fourth Proportional to 8,610.80, 12,916.20 and 6,105.20

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Solution

The fourth proportional to 8,610.80, 12,916.20 and 6,105.20 is: 9,157.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,610.80 : 12,916.20 = 6,105.20 : x
  2. Step 2: Convert to fraction form
    8,610.80/12,916.20 = 6,105.20/x
  3. Step 3: Cross multiply
    8,610.80x = 12,916.20 × 6,105.20
  4. Step 4: Simplify right side
    8,610.80x = 78,855,984.24
  5. Step 5: Solve for x
    x = 78,855,984.24/8,610.80
  6. Step 6: Final answer
    x = 9,157.80

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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.