Home / 21,278.72-31,907.40-12,396.92

Finding the Fourth Proportional to 21,278.72, 31,907.40 and 12,396.92

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Solution

The fourth proportional to 21,278.72, 31,907.40 and 12,396.92 is: 18,589.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,278.72 : 31,907.40 = 12,396.92 : x
  2. Step 2: Convert to fraction form
    21,278.72/31,907.40 = 12,396.92/x
  3. Step 3: Cross multiply
    21,278.72x = 31,907.40 × 12,396.92
  4. Step 4: Simplify right side
    21,278.72x = 395,553,485.21
  5. Step 5: Solve for x
    x = 395,553,485.21/21,278.72
  6. Step 6: Final answer
    x = 18,589.16

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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.