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Finding the Fourth Proportional to 7,167.65, 9,890.12 and 3,980.43

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Solution

The fourth proportional to 7,167.65, 9,890.12 and 3,980.43 is: 5,492.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,167.65 : 9,890.12 = 3,980.43 : x
  2. Step 2: Convert to fraction form
    7,167.65/9,890.12 = 3,980.43/x
  3. Step 3: Cross multiply
    7,167.65x = 9,890.12 × 3,980.43
  4. Step 4: Simplify right side
    7,167.65x = 39,366,940.30
  5. Step 5: Solve for x
    x = 39,366,940.30/7,167.65
  6. Step 6: Final answer
    x = 5,492.31

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Double scale
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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.