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Finding the Fourth Proportional to 18,689.28, 28,033.91 and 12,828.12

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Solution

The fourth proportional to 18,689.28, 28,033.91 and 12,828.12 is: 19,242.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,689.28 : 28,033.91 = 12,828.12 : x
  2. Step 2: Convert to fraction form
    18,689.28/28,033.91 = 12,828.12/x
  3. Step 3: Cross multiply
    18,689.28x = 28,033.91 × 12,828.12
  4. Step 4: Simplify right side
    18,689.28x = 359,622,361.55
  5. Step 5: Solve for x
    x = 359,622,361.55/18,689.28
  6. Step 6: Final answer
    x = 19,242.17

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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.