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Finding the Fourth Proportional to 7,939.67, 11,890.67 and 6,290.91

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Solution

The fourth proportional to 7,939.67, 11,890.67 and 6,290.91 is: 9,421.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,939.67 : 11,890.67 = 6,290.91 : x
  2. Step 2: Convert to fraction form
    7,939.67/11,890.67 = 6,290.91/x
  3. Step 3: Cross multiply
    7,939.67x = 11,890.67 × 6,290.91
  4. Step 4: Simplify right side
    7,939.67x = 74,803,103.36
  5. Step 5: Solve for x
    x = 74,803,103.36/7,939.67
  6. Step 6: Final answer
    x = 9,421.44

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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.