Home / 21,006.40-31,507.04-5,422.72

Finding the Fourth Proportional to 21,006.40, 31,507.04 and 5,422.72

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Solution

The fourth proportional to 21,006.40, 31,507.04 and 5,422.72 is: 8,133.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,006.40 : 31,507.04 = 5,422.72 : x
  2. Step 2: Convert to fraction form
    21,006.40/31,507.04 = 5,422.72/x
  3. Step 3: Cross multiply
    21,006.40x = 31,507.04 × 5,422.72
  4. Step 4: Simplify right side
    21,006.40x = 170,853,855.95
  5. Step 5: Solve for x
    x = 170,853,855.95/21,006.40
  6. Step 6: Final answer
    x = 8,133.42

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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.