Home / 20,856.64-31,286.40-7,708.72

Finding the Fourth Proportional to 20,856.64, 31,286.40 and 7,708.72

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Solution

The fourth proportional to 20,856.64, 31,286.40 and 7,708.72 is: 11,563.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.64 : 31,286.40 = 7,708.72 : x
  2. Step 2: Convert to fraction form
    20,856.64/31,286.40 = 7,708.72/x
  3. Step 3: Cross multiply
    20,856.64x = 31,286.40 × 7,708.72
  4. Step 4: Simplify right side
    20,856.64x = 241,178,097.41
  5. Step 5: Solve for x
    x = 241,178,097.41/20,856.64
  6. Step 6: Final answer
    x = 11,563.61

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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.