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Finding the Fourth Proportional to 7,974.10, 10,990.08 and 7,057.54

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Solution

The fourth proportional to 7,974.10, 10,990.08 and 7,057.54 is: 9,726.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,974.10 : 10,990.08 = 7,057.54 : x
  2. Step 2: Convert to fraction form
    7,974.10/10,990.08 = 7,057.54/x
  3. Step 3: Cross multiply
    7,974.10x = 10,990.08 × 7,057.54
  4. Step 4: Simplify right side
    7,974.10x = 77,562,929.20
  5. Step 5: Solve for x
    x = 77,562,929.20/7,974.10
  6. Step 6: Final answer
    x = 9,726.86

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.