Home / 15,921.12-21,920.79-12,132.12

Finding the Fourth Proportional to 15,921.12, 21,920.79 and 12,132.12

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Solution

The fourth proportional to 15,921.12, 21,920.79 and 12,132.12 is: 16,703.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,921.12 : 21,920.79 = 12,132.12 : x
  2. Step 2: Convert to fraction form
    15,921.12/21,920.79 = 12,132.12/x
  3. Step 3: Cross multiply
    15,921.12x = 21,920.79 × 12,132.12
  4. Step 4: Simplify right side
    15,921.12x = 265,945,654.77
  5. Step 5: Solve for x
    x = 265,945,654.77/15,921.12
  6. Step 6: Final answer
    x = 16,703.95

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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.