Home / 21,278.97-31,907.78-12,397.17

Finding the Fourth Proportional to 21,278.97, 31,907.78 and 12,397.17

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Solution

The fourth proportional to 21,278.97, 31,907.78 and 12,397.17 is: 18,589.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.97 : 31,907.78 = 12,397.17 : x
  2. Step 2: Convert to fraction form
    21,278.97/31,907.78 = 12,397.17/x
  3. Step 3: Cross multiply
    21,278.97x = 31,907.78 × 12,397.17
  4. Step 4: Simplify right side
    21,278.97x = 395,566,111.00
  5. Step 5: Solve for x
    x = 395,566,111.00/21,278.97
  6. Step 6: Final answer
    x = 18,589.53

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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.