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Finding the Fourth Proportional to 15,074.79, 20,803.20 and 9,105.30

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Solution

The fourth proportional to 15,074.79, 20,803.20 and 9,105.30 is: 12,565.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,074.79 : 20,803.20 = 9,105.30 : x
  2. Step 2: Convert to fraction form
    15,074.79/20,803.20 = 9,105.30/x
  3. Step 3: Cross multiply
    15,074.79x = 20,803.20 × 9,105.30
  4. Step 4: Simplify right side
    15,074.79x = 189,419,376.96
  5. Step 5: Solve for x
    x = 189,419,376.96/15,074.79
  6. Step 6: Final answer
    x = 12,565.31

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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.