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Finding the Fourth Proportional to 15,145.20, 20,899.56 and 8,770.68

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Solution

The fourth proportional to 15,145.20, 20,899.56 and 8,770.68 is: 12,103.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,145.20 : 20,899.56 = 8,770.68 : x
  2. Step 2: Convert to fraction form
    15,145.20/20,899.56 = 8,770.68/x
  3. Step 3: Cross multiply
    15,145.20x = 20,899.56 × 8,770.68
  4. Step 4: Simplify right side
    15,145.20x = 183,303,352.90
  5. Step 5: Solve for x
    x = 183,303,352.90/15,145.20
  6. Step 6: Final answer
    x = 12,103.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.