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Finding the Fourth Proportional to 15,803.98, 21,809.31 and 8,633.86

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Solution

The fourth proportional to 15,803.98, 21,809.31 and 8,633.86 is: 11,914.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,803.98 : 21,809.31 = 8,633.86 : x
  2. Step 2: Convert to fraction form
    15,803.98/21,809.31 = 8,633.86/x
  3. Step 3: Cross multiply
    15,803.98x = 21,809.31 × 8,633.86
  4. Step 4: Simplify right side
    15,803.98x = 188,298,486.07
  5. Step 5: Solve for x
    x = 188,298,486.07/15,803.98
  6. Step 6: Final answer
    x = 11,914.62

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.