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Finding the Fourth Proportional to 12,805.65, 17,671.91 and 7,141.05

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Solution

The fourth proportional to 12,805.65, 17,671.91 and 7,141.05 is: 9,854.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,805.65 : 17,671.91 = 7,141.05 : x
  2. Step 2: Convert to fraction form
    12,805.65/17,671.91 = 7,141.05/x
  3. Step 3: Cross multiply
    12,805.65x = 17,671.91 × 7,141.05
  4. Step 4: Simplify right side
    12,805.65x = 126,195,957.20
  5. Step 5: Solve for x
    x = 126,195,957.20/12,805.65
  6. Step 6: Final answer
    x = 9,854.71

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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.