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Finding the Fourth Proportional to 18,872.40, 28,265.40 and 18,440.40

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Solution

The fourth proportional to 18,872.40, 28,265.40 and 18,440.40 is: 27,618.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,872.40 : 28,265.40 = 18,440.40 : x
  2. Step 2: Convert to fraction form
    18,872.40/28,265.40 = 18,440.40/x
  3. Step 3: Cross multiply
    18,872.40x = 28,265.40 × 18,440.40
  4. Step 4: Simplify right side
    18,872.40x = 521,225,282.16
  5. Step 5: Solve for x
    x = 521,225,282.16/18,872.40
  6. Step 6: Final answer
    x = 27,618.39

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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.