Home / 21,279.13-31,933.27-7,428.13

Finding the Fourth Proportional to 21,279.13, 31,933.27 and 7,428.13

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Solution

The fourth proportional to 21,279.13, 31,933.27 and 7,428.13 is: 11,147.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,279.13 : 31,933.27 = 7,428.13 : x
  2. Step 2: Convert to fraction form
    21,279.13/31,933.27 = 7,428.13/x
  3. Step 3: Cross multiply
    21,279.13x = 31,933.27 × 7,428.13
  4. Step 4: Simplify right side
    21,279.13x = 237,204,480.89
  5. Step 5: Solve for x
    x = 237,204,480.89/21,279.13
  6. Step 6: Final answer
    x = 11,147.28

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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.