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Finding the Fourth Proportional to 18,759.65, 28,139.48 and 7,520.12

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Solution

The fourth proportional to 18,759.65, 28,139.48 and 7,520.12 is: 11,280.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,759.65 : 28,139.48 = 7,520.12 : x
  2. Step 2: Convert to fraction form
    18,759.65/28,139.48 = 7,520.12/x
  3. Step 3: Cross multiply
    18,759.65x = 28,139.48 × 7,520.12
  4. Step 4: Simplify right side
    18,759.65x = 211,612,422.35
  5. Step 5: Solve for x
    x = 211,612,422.35/18,759.65
  6. Step 6: Final answer
    x = 11,280.19

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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.