Home / 20,856.88-31,289.40-9,170.06

Finding the Fourth Proportional to 20,856.88, 31,289.40 and 9,170.06

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Solution

The fourth proportional to 20,856.88, 31,289.40 and 9,170.06 is: 13,756.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.88 : 31,289.40 = 9,170.06 : x
  2. Step 2: Convert to fraction form
    20,856.88/31,289.40 = 9,170.06/x
  3. Step 3: Cross multiply
    20,856.88x = 31,289.40 × 9,170.06
  4. Step 4: Simplify right side
    20,856.88x = 286,925,675.36
  5. Step 5: Solve for x
    x = 286,925,675.36/20,856.88
  6. Step 6: Final answer
    x = 13,756.88

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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.