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Finding the Fourth Proportional to 19,168.70, 28,735.95 and 7,479.20

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Solution

The fourth proportional to 19,168.70, 28,735.95 and 7,479.20 is: 11,212.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,168.70 : 28,735.95 = 7,479.20 : x
  2. Step 2: Convert to fraction form
    19,168.70/28,735.95 = 7,479.20/x
  3. Step 3: Cross multiply
    19,168.70x = 28,735.95 × 7,479.20
  4. Step 4: Simplify right side
    19,168.70x = 214,921,917.24
  5. Step 5: Solve for x
    x = 214,921,917.24/19,168.70
  6. Step 6: Final answer
    x = 11,212.13

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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.