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Finding the Fourth Proportional to 9,866.91, 13,616.67 and 5,390.85

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Solution

The fourth proportional to 9,866.91, 13,616.67 and 5,390.85 is: 7,439.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,866.91 : 13,616.67 = 5,390.85 : x
  2. Step 2: Convert to fraction form
    9,866.91/13,616.67 = 5,390.85/x
  3. Step 3: Cross multiply
    9,866.91x = 13,616.67 × 5,390.85
  4. Step 4: Simplify right side
    9,866.91x = 73,405,425.47
  5. Step 5: Solve for x
    x = 73,405,425.47/9,866.91
  6. Step 6: Final answer
    x = 7,439.56

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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.