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Finding the Fourth Proportional to 19,109, 28,667.58 and 7,422.20

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Solution

The fourth proportional to 19,109, 28,667.58 and 7,422.20 is: 11,134.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,109 : 28,667.58 = 7,422.20 : x
  2. Step 2: Convert to fraction form
    19,109/28,667.58 = 7,422.20/x
  3. Step 3: Cross multiply
    19,109x = 28,667.58 × 7,422.20
  4. Step 4: Simplify right side
    19,109x = 212,776,512.28
  5. Step 5: Solve for x
    x = 212,776,512.28/19,109
  6. Step 6: Final answer
    x = 11,134.88

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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.