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Finding the Fourth Proportional to 8,990.71, 13,486.07 and 3,145.98

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Solution

The fourth proportional to 8,990.71, 13,486.07 and 3,145.98 is: 4,718.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,990.71 : 13,486.07 = 3,145.98 : x
  2. Step 2: Convert to fraction form
    8,990.71/13,486.07 = 3,145.98/x
  3. Step 3: Cross multiply
    8,990.71x = 13,486.07 × 3,145.98
  4. Step 4: Simplify right side
    8,990.71x = 42,426,906.50
  5. Step 5: Solve for x
    x = 42,426,906.50/8,990.71
  6. Step 6: Final answer
    x = 4,718.97

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Similar ratio
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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.