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Finding the Fourth Proportional to 7,221.77, 9,964.91 and 4,077.89

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Solution

The fourth proportional to 7,221.77, 9,964.91 and 4,077.89 is: 5,626.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,221.77 : 9,964.91 = 4,077.89 : x
  2. Step 2: Convert to fraction form
    7,221.77/9,964.91 = 4,077.89/x
  3. Step 3: Cross multiply
    7,221.77x = 9,964.91 × 4,077.89
  4. Step 4: Simplify right side
    7,221.77x = 40,635,757.02
  5. Step 5: Solve for x
    x = 40,635,757.02/7,221.77
  6. Step 6: Final answer
    x = 5,626.85

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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.