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Finding the Fourth Proportional to 11,578.81, 15,979.06 and 7,099.99

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Solution

The fourth proportional to 11,578.81, 15,979.06 and 7,099.99 is: 9,798.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,578.81 : 15,979.06 = 7,099.99 : x
  2. Step 2: Convert to fraction form
    11,578.81/15,979.06 = 7,099.99/x
  3. Step 3: Cross multiply
    11,578.81x = 15,979.06 × 7,099.99
  4. Step 4: Simplify right side
    11,578.81x = 113,451,166.21
  5. Step 5: Solve for x
    x = 113,451,166.21/11,578.81
  6. Step 6: Final answer
    x = 9,798.17

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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.