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Finding the Fourth Proportional to 7,122.99, 9,829.74 and 3,979.17

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Solution

The fourth proportional to 7,122.99, 9,829.74 and 3,979.17 is: 5,491.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.99 : 9,829.74 = 3,979.17 : x
  2. Step 2: Convert to fraction form
    7,122.99/9,829.74 = 3,979.17/x
  3. Step 3: Cross multiply
    7,122.99x = 9,829.74 × 3,979.17
  4. Step 4: Simplify right side
    7,122.99x = 39,114,206.52
  5. Step 5: Solve for x
    x = 39,114,206.52/7,122.99
  6. Step 6: Final answer
    x = 5,491.26

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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.