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Finding the Fourth Proportional to 19,212.55, 28,819.70 and 7,207.57

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Solution

The fourth proportional to 19,212.55, 28,819.70 and 7,207.57 is: 10,811.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,212.55 : 28,819.70 = 7,207.57 : x
  2. Step 2: Convert to fraction form
    19,212.55/28,819.70 = 7,207.57/x
  3. Step 3: Cross multiply
    19,212.55x = 28,819.70 × 7,207.57
  4. Step 4: Simplify right side
    19,212.55x = 207,720,005.13
  5. Step 5: Solve for x
    x = 207,720,005.13/19,212.55
  6. Step 6: Final answer
    x = 10,811.68

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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.