Home / 20,885.15-28,816.96-12,383.06

Finding the Fourth Proportional to 20,885.15, 28,816.96 and 12,383.06

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Solution

The fourth proportional to 20,885.15, 28,816.96 and 12,383.06 is: 17,085.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,885.15 : 28,816.96 = 12,383.06 : x
  2. Step 2: Convert to fraction form
    20,885.15/28,816.96 = 12,383.06/x
  3. Step 3: Cross multiply
    20,885.15x = 28,816.96 × 12,383.06
  4. Step 4: Simplify right side
    20,885.15x = 356,842,144.70
  5. Step 5: Solve for x
    x = 356,842,144.70/20,885.15
  6. Step 6: Final answer
    x = 17,085.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.