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Finding the Fourth Proportional to 15,528.82, 21,428.63 and 8,813.82

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Solution

The fourth proportional to 15,528.82, 21,428.63 and 8,813.82 is: 12,162.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,528.82 : 21,428.63 = 8,813.82 : x
  2. Step 2: Convert to fraction form
    15,528.82/21,428.63 = 8,813.82/x
  3. Step 3: Cross multiply
    15,528.82x = 21,428.63 × 8,813.82
  4. Step 4: Simplify right side
    15,528.82x = 188,868,087.67
  5. Step 5: Solve for x
    x = 188,868,087.67/15,528.82
  6. Step 6: Final answer
    x = 12,162.42

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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.