Home / 12,920.95-19,381.49-5,129.75

Finding the Fourth Proportional to 12,920.95, 19,381.49 and 5,129.75

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Solution

The fourth proportional to 12,920.95, 19,381.49 and 5,129.75 is: 7,694.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920.95 : 19,381.49 = 5,129.75 : x
  2. Step 2: Convert to fraction form
    12,920.95/19,381.49 = 5,129.75/x
  3. Step 3: Cross multiply
    12,920.95x = 19,381.49 × 5,129.75
  4. Step 4: Simplify right side
    12,920.95x = 99,422,172.68
  5. Step 5: Solve for x
    x = 99,422,172.68/12,920.95
  6. Step 6: Final answer
    x = 7,694.65

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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.