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Finding the Fourth Proportional to 10,280.20, 15,420.30 and 5,906.20

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Solution

The fourth proportional to 10,280.20, 15,420.30 and 5,906.20 is: 8,859.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,280.20 : 15,420.30 = 5,906.20 : x
  2. Step 2: Convert to fraction form
    10,280.20/15,420.30 = 5,906.20/x
  3. Step 3: Cross multiply
    10,280.20x = 15,420.30 × 5,906.20
  4. Step 4: Simplify right side
    10,280.20x = 91,075,375.86
  5. Step 5: Solve for x
    x = 91,075,375.86/10,280.20
  6. Step 6: Final answer
    x = 8,859.30

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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.