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Finding the Fourth Proportional to 20,699.20, 31,053.99 and 8,215.10

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Solution

The fourth proportional to 20,699.20, 31,053.99 and 8,215.10 is: 12,324.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.20 : 31,053.99 = 8,215.10 : x
  2. Step 2: Convert to fraction form
    20,699.20/31,053.99 = 8,215.10/x
  3. Step 3: Cross multiply
    20,699.20x = 31,053.99 × 8,215.10
  4. Step 4: Simplify right side
    20,699.20x = 255,111,436.90
  5. Step 5: Solve for x
    x = 255,111,436.90/20,699.20
  6. Step 6: Final answer
    x = 12,324.70

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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.