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Finding the Fourth Proportional to 7,874.91, 11,816.48 and 7,421.11

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Solution

The fourth proportional to 7,874.91, 11,816.48 and 7,421.11 is: 11,135.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,874.91 : 11,816.48 = 7,421.11 : x
  2. Step 2: Convert to fraction form
    7,874.91/11,816.48 = 7,421.11/x
  3. Step 3: Cross multiply
    7,874.91x = 11,816.48 × 7,421.11
  4. Step 4: Simplify right side
    7,874.91x = 87,691,386.90
  5. Step 5: Solve for x
    x = 87,691,386.90/7,874.91
  6. Step 6: Final answer
    x = 11,135.54

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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.