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Finding the Fourth Proportional to 7,291.12, 10,061.76 and 3,979.12

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Solution

The fourth proportional to 7,291.12, 10,061.76 and 3,979.12 is: 5,491.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,291.12 : 10,061.76 = 3,979.12 : x
  2. Step 2: Convert to fraction form
    7,291.12/10,061.76 = 3,979.12/x
  3. Step 3: Cross multiply
    7,291.12x = 10,061.76 × 3,979.12
  4. Step 4: Simplify right side
    7,291.12x = 40,036,950.45
  5. Step 5: Solve for x
    x = 40,036,950.45/7,291.12
  6. Step 6: Final answer
    x = 5,491.19

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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.