Home / 21,120.50-31,691.75-15,324.95

Finding the Fourth Proportional to 21,120.50, 31,691.75 and 15,324.95

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Solution

The fourth proportional to 21,120.50, 31,691.75 and 15,324.95 is: 22,995.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.50 : 31,691.75 = 15,324.95 : x
  2. Step 2: Convert to fraction form
    21,120.50/31,691.75 = 15,324.95/x
  3. Step 3: Cross multiply
    21,120.50x = 31,691.75 × 15,324.95
  4. Step 4: Simplify right side
    21,120.50x = 485,674,249.08
  5. Step 5: Solve for x
    x = 485,674,249.08/21,120.50
  6. Step 6: Final answer
    x = 22,995.40

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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.