Home / 21,920.45-30,251.95-12,488.81

Finding the Fourth Proportional to 21,920.45, 30,251.95 and 12,488.81

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Solution

The fourth proportional to 21,920.45, 30,251.95 and 12,488.81 is: 17,235.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.45 : 30,251.95 = 12,488.81 : x
  2. Step 2: Convert to fraction form
    21,920.45/30,251.95 = 12,488.81/x
  3. Step 3: Cross multiply
    21,920.45x = 30,251.95 × 12,488.81
  4. Step 4: Simplify right side
    21,920.45x = 377,810,673.20
  5. Step 5: Solve for x
    x = 377,810,673.20/21,920.45
  6. Step 6: Final answer
    x = 17,235.54

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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.