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Finding the Fourth Proportional to 7,291.13, 10,061.78 and 3,979.13

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Solution

The fourth proportional to 7,291.13, 10,061.78 and 3,979.13 is: 5,491.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,291.13 : 10,061.78 = 3,979.13 : x
  2. Step 2: Convert to fraction form
    7,291.13/10,061.78 = 3,979.13/x
  3. Step 3: Cross multiply
    7,291.13x = 10,061.78 × 3,979.13
  4. Step 4: Simplify right side
    7,291.13x = 40,037,060.45
  5. Step 5: Solve for x
    x = 40,037,060.45/7,291.13
  6. Step 6: Final answer
    x = 5,491.20

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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.