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Finding the Fourth Proportional to 15,161.52, 20,919.60 and 8,870.16

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Solution

The fourth proportional to 15,161.52, 20,919.60 and 8,870.16 is: 12,238.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,161.52 : 20,919.60 = 8,870.16 : x
  2. Step 2: Convert to fraction form
    15,161.52/20,919.60 = 8,870.16/x
  3. Step 3: Cross multiply
    15,161.52x = 20,919.60 × 8,870.16
  4. Step 4: Simplify right side
    15,161.52x = 185,560,199.14
  5. Step 5: Solve for x
    x = 185,560,199.14/15,161.52
  6. Step 6: Final answer
    x = 12,238.89

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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.