Home / 20,811.12-31,216.32-5,228.72

Finding the Fourth Proportional to 20,811.12, 31,216.32 and 5,228.72

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Solution

The fourth proportional to 20,811.12, 31,216.32 and 5,228.72 is: 7,842.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.12 : 31,216.32 = 5,228.72 : x
  2. Step 2: Convert to fraction form
    20,811.12/31,216.32 = 5,228.72/x
  3. Step 3: Cross multiply
    20,811.12x = 31,216.32 × 5,228.72
  4. Step 4: Simplify right side
    20,811.12x = 163,221,396.71
  5. Step 5: Solve for x
    x = 163,221,396.71/20,811.12
  6. Step 6: Final answer
    x = 7,842.99

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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.