Home / 21,331.20-31,994.88-7,479.36

Finding the Fourth Proportional to 21,331.20, 31,994.88 and 7,479.36

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Solution

The fourth proportional to 21,331.20, 31,994.88 and 7,479.36 is: 11,218.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,331.20 : 31,994.88 = 7,479.36 : x
  2. Step 2: Convert to fraction form
    21,331.20/31,994.88 = 7,479.36/x
  3. Step 3: Cross multiply
    21,331.20x = 31,994.88 × 7,479.36
  4. Step 4: Simplify right side
    21,331.20x = 239,301,225.68
  5. Step 5: Solve for x
    x = 239,301,225.68/21,331.20
  6. Step 6: Final answer
    x = 11,218.37

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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.