Home / 21,322.40-31,983.60-11,991.20

Finding the Fourth Proportional to 21,322.40, 31,983.60 and 11,991.20

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Solution

The fourth proportional to 21,322.40, 31,983.60 and 11,991.20 is: 17,986.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,322.40 : 31,983.60 = 11,991.20 : x
  2. Step 2: Convert to fraction form
    21,322.40/31,983.60 = 11,991.20/x
  3. Step 3: Cross multiply
    21,322.40x = 31,983.60 × 11,991.20
  4. Step 4: Simplify right side
    21,322.40x = 383,521,744.32
  5. Step 5: Solve for x
    x = 383,521,744.32/21,322.40
  6. Step 6: Final answer
    x = 17,986.80

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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.