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Finding the Fourth Proportional to 18,821.84, 28,228.64 and 7,717.60

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Solution

The fourth proportional to 18,821.84, 28,228.64 and 7,717.60 is: 11,574.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,821.84 : 28,228.64 = 7,717.60 : x
  2. Step 2: Convert to fraction form
    18,821.84/28,228.64 = 7,717.60/x
  3. Step 3: Cross multiply
    18,821.84x = 28,228.64 × 7,717.60
  4. Step 4: Simplify right side
    18,821.84x = 217,857,352.06
  5. Step 5: Solve for x
    x = 217,857,352.06/18,821.84
  6. Step 6: Final answer
    x = 11,574.71

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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.