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Finding the Fourth Proportional to 10,478.85, 15,690.74 and 8,808.90

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Solution

The fourth proportional to 10,478.85, 15,690.74 and 8,808.90 is: 13,190.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,478.85 : 15,690.74 = 8,808.90 : x
  2. Step 2: Convert to fraction form
    10,478.85/15,690.74 = 8,808.90/x
  3. Step 3: Cross multiply
    10,478.85x = 15,690.74 × 8,808.90
  4. Step 4: Simplify right side
    10,478.85x = 138,218,115.54
  5. Step 5: Solve for x
    x = 138,218,115.54/10,478.85
  6. Step 6: Final answer
    x = 13,190.20

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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.