Home / 21,076.12-31,589.86-7,920.08

Finding the Fourth Proportional to 21,076.12, 31,589.86 and 7,920.08

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Solution

The fourth proportional to 21,076.12, 31,589.86 and 7,920.08 is: 11,870.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,076.12 : 31,589.86 = 7,920.08 : x
  2. Step 2: Convert to fraction form
    21,076.12/31,589.86 = 7,920.08/x
  3. Step 3: Cross multiply
    21,076.12x = 31,589.86 × 7,920.08
  4. Step 4: Simplify right side
    21,076.12x = 250,194,218.39
  5. Step 5: Solve for x
    x = 250,194,218.39/21,076.12
  6. Step 6: Final answer
    x = 11,870.98

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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.