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Finding the Fourth Proportional to 15,158.95, 20,919.93 and 8,785.75

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Solution

The fourth proportional to 15,158.95, 20,919.93 and 8,785.75 is: 12,124.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,158.95 : 20,919.93 = 8,785.75 : x
  2. Step 2: Convert to fraction form
    15,158.95/20,919.93 = 8,785.75/x
  3. Step 3: Cross multiply
    15,158.95x = 20,919.93 × 8,785.75
  4. Step 4: Simplify right side
    15,158.95x = 183,797,275.00
  5. Step 5: Solve for x
    x = 183,797,275.00/15,158.95
  6. Step 6: Final answer
    x = 12,124.67

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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.