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Finding the Fourth Proportional to 11,920.84, 17,880.99 and 7,021.56

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Solution

The fourth proportional to 11,920.84, 17,880.99 and 7,021.56 is: 10,532.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,920.84 : 17,880.99 = 7,021.56 : x
  2. Step 2: Convert to fraction form
    11,920.84/17,880.99 = 7,021.56/x
  3. Step 3: Cross multiply
    11,920.84x = 17,880.99 × 7,021.56
  4. Step 4: Simplify right side
    11,920.84x = 125,552,444.14
  5. Step 5: Solve for x
    x = 125,552,444.14/11,920.84
  6. Step 6: Final answer
    x = 10,532.18

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.