Home / 15,785.42-21,783.30-8,711.69

Finding the Fourth Proportional to 15,785.42, 21,783.30 and 8,711.69

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Solution

The fourth proportional to 15,785.42, 21,783.30 and 8,711.69 is: 12,021.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,785.42 : 21,783.30 = 8,711.69 : x
  2. Step 2: Convert to fraction form
    15,785.42/21,783.30 = 8,711.69/x
  3. Step 3: Cross multiply
    15,785.42x = 21,783.30 × 8,711.69
  4. Step 4: Simplify right side
    15,785.42x = 189,769,247.86
  5. Step 5: Solve for x
    x = 189,769,247.86/15,785.42
  6. Step 6: Final answer
    x = 12,021.81

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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.