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Finding the Fourth Proportional to 8,389.20, 12,562.20 and 6,661.20

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Solution

The fourth proportional to 8,389.20, 12,562.20 and 6,661.20 is: 9,974.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,389.20 : 12,562.20 = 6,661.20 : x
  2. Step 2: Convert to fraction form
    8,389.20/12,562.20 = 6,661.20/x
  3. Step 3: Cross multiply
    8,389.20x = 12,562.20 × 6,661.20
  4. Step 4: Simplify right side
    8,389.20x = 83,679,326.64
  5. Step 5: Solve for x
    x = 83,679,326.64/8,389.20
  6. Step 6: Final answer
    x = 9,974.65

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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.