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Finding the Fourth Proportional to 19,159.20, 28,721.70 and 7,469.70

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Solution

The fourth proportional to 19,159.20, 28,721.70 and 7,469.70 is: 11,197.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,159.20 : 28,721.70 = 7,469.70 : x
  2. Step 2: Convert to fraction form
    19,159.20/28,721.70 = 7,469.70/x
  3. Step 3: Cross multiply
    19,159.20x = 28,721.70 × 7,469.70
  4. Step 4: Simplify right side
    19,159.20x = 214,542,482.49
  5. Step 5: Solve for x
    x = 214,542,482.49/19,159.20
  6. Step 6: Final answer
    x = 11,197.88

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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.