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Finding the Fourth Proportional to 20,641.48, 28,486.50 and 11,689.88

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Solution

The fourth proportional to 20,641.48, 28,486.50 and 11,689.88 is: 16,132.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,641.48 : 28,486.50 = 11,689.88 : x
  2. Step 2: Convert to fraction form
    20,641.48/28,486.50 = 11,689.88/x
  3. Step 3: Cross multiply
    20,641.48x = 28,486.50 × 11,689.88
  4. Step 4: Simplify right side
    20,641.48x = 333,003,766.62
  5. Step 5: Solve for x
    x = 333,003,766.62/20,641.48
  6. Step 6: Final answer
    x = 16,132.75

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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.