Home / 20,922.15-31,383.12-9,828.78

Finding the Fourth Proportional to 20,922.15, 31,383.12 and 9,828.78

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Solution

The fourth proportional to 20,922.15, 31,383.12 and 9,828.78 is: 14,743.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,922.15 : 31,383.12 = 9,828.78 : x
  2. Step 2: Convert to fraction form
    20,922.15/31,383.12 = 9,828.78/x
  3. Step 3: Cross multiply
    20,922.15x = 31,383.12 × 9,828.78
  4. Step 4: Simplify right side
    20,922.15x = 308,457,782.19
  5. Step 5: Solve for x
    x = 308,457,782.19/20,922.15
  6. Step 6: Final answer
    x = 14,743.12

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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.