Home / 15,789.28-21,789.21-8,715.71

Finding the Fourth Proportional to 15,789.28, 21,789.21 and 8,715.71

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Solution

The fourth proportional to 15,789.28, 21,789.21 and 8,715.71 is: 12,027.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,789.28 : 21,789.21 = 8,715.71 : x
  2. Step 2: Convert to fraction form
    15,789.28/21,789.21 = 8,715.71/x
  3. Step 3: Cross multiply
    15,789.28x = 21,789.21 × 8,715.71
  4. Step 4: Simplify right side
    15,789.28x = 189,908,435.49
  5. Step 5: Solve for x
    x = 189,908,435.49/15,789.28
  6. Step 6: Final answer
    x = 12,027.68

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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.