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Finding the Fourth Proportional to 19,099.20, 28,648.64 and 7,420.64

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Solution

The fourth proportional to 19,099.20, 28,648.64 and 7,420.64 is: 11,130.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,099.20 : 28,648.64 = 7,420.64 : x
  2. Step 2: Convert to fraction form
    19,099.20/28,648.64 = 7,420.64/x
  3. Step 3: Cross multiply
    19,099.20x = 28,648.64 × 7,420.64
  4. Step 4: Simplify right side
    19,099.20x = 212,591,243.93
  5. Step 5: Solve for x
    x = 212,591,243.93/19,099.20
  6. Step 6: Final answer
    x = 11,130.90

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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.