Home / 20,856.38-31,288.65-9,169.56

Finding the Fourth Proportional to 20,856.38, 31,288.65 and 9,169.56

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Solution

The fourth proportional to 20,856.38, 31,288.65 and 9,169.56 is: 13,756.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.38 : 31,288.65 = 9,169.56 : x
  2. Step 2: Convert to fraction form
    20,856.38/31,288.65 = 9,169.56/x
  3. Step 3: Cross multiply
    20,856.38x = 31,288.65 × 9,169.56
  4. Step 4: Simplify right side
    20,856.38x = 286,903,153.49
  5. Step 5: Solve for x
    x = 286,903,153.49/20,856.38
  6. Step 6: Final answer
    x = 13,756.13

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.