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Finding the Fourth Proportional to 7,149.91, 9,866.65 and 3,919.72

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Solution

The fourth proportional to 7,149.91, 9,866.65 and 3,919.72 is: 5,409.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,149.91 : 9,866.65 = 3,919.72 : x
  2. Step 2: Convert to fraction form
    7,149.91/9,866.65 = 3,919.72/x
  3. Step 3: Cross multiply
    7,149.91x = 9,866.65 × 3,919.72
  4. Step 4: Simplify right side
    7,149.91x = 38,674,505.34
  5. Step 5: Solve for x
    x = 38,674,505.34/7,149.91
  6. Step 6: Final answer
    x = 5,409.09

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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.