Home / 21,318.12-31,983.84-7,278.48

Finding the Fourth Proportional to 21,318.12, 31,983.84 and 7,278.48

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Solution

The fourth proportional to 21,318.12, 31,983.84 and 7,278.48 is: 10,919.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,318.12 : 31,983.84 = 7,278.48 : x
  2. Step 2: Convert to fraction form
    21,318.12/31,983.84 = 7,278.48/x
  3. Step 3: Cross multiply
    21,318.12x = 31,983.84 × 7,278.48
  4. Step 4: Simplify right side
    21,318.12x = 232,793,739.76
  5. Step 5: Solve for x
    x = 232,793,739.76/21,318.12
  6. Step 6: Final answer
    x = 10,919.99

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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.