Home / 20,918.40-31,356.54-9,229.56

Finding the Fourth Proportional to 20,918.40, 31,356.54 and 9,229.56

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Solution

The fourth proportional to 20,918.40, 31,356.54 and 9,229.56 is: 13,835.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,918.40 : 31,356.54 = 9,229.56 : x
  2. Step 2: Convert to fraction form
    20,918.40/31,356.54 = 9,229.56/x
  3. Step 3: Cross multiply
    20,918.40x = 31,356.54 × 9,229.56
  4. Step 4: Simplify right side
    20,918.40x = 289,407,067.32
  5. Step 5: Solve for x
    x = 289,407,067.32/20,918.40
  6. Step 6: Final answer
    x = 13,835.05

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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.