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Finding the Fourth Proportional to 21,038.22, 31,553.01 and 7,890.30

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Solution

The fourth proportional to 21,038.22, 31,553.01 and 7,890.30 is: 11,833.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,038.22 : 31,553.01 = 7,890.30 : x
  2. Step 2: Convert to fraction form
    21,038.22/31,553.01 = 7,890.30/x
  3. Step 3: Cross multiply
    21,038.22x = 31,553.01 × 7,890.30
  4. Step 4: Simplify right side
    21,038.22x = 248,962,714.80
  5. Step 5: Solve for x
    x = 248,962,714.80/21,038.22
  6. Step 6: Final answer
    x = 11,833.83

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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.