Home / 21,013.50-31,498.98-13,622.65

Finding the Fourth Proportional to 21,013.50, 31,498.98 and 13,622.65

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Solution

The fourth proportional to 21,013.50, 31,498.98 and 13,622.65 is: 20,420.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,013.50 : 31,498.98 = 13,622.65 : x
  2. Step 2: Convert to fraction form
    21,013.50/31,498.98 = 13,622.65/x
  3. Step 3: Cross multiply
    21,013.50x = 31,498.98 × 13,622.65
  4. Step 4: Simplify right side
    21,013.50x = 429,099,579.90
  5. Step 5: Solve for x
    x = 429,099,579.90/21,013.50
  6. Step 6: Final answer
    x = 20,420.19

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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.