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Finding the Fourth Proportional to 15,191.50, 20,965.08 and 8,905.90

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Solution

The fourth proportional to 15,191.50, 20,965.08 and 8,905.90 is: 12,290.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,191.50 : 20,965.08 = 8,905.90 : x
  2. Step 2: Convert to fraction form
    15,191.50/20,965.08 = 8,905.90/x
  3. Step 3: Cross multiply
    15,191.50x = 20,965.08 × 8,905.90
  4. Step 4: Simplify right side
    15,191.50x = 186,712,905.97
  5. Step 5: Solve for x
    x = 186,712,905.97/15,191.50
  6. Step 6: Final answer
    x = 12,290.62

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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.