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Finding the Fourth Proportional to 8,659.76, 12,989.63 and 3,113.12

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Solution

The fourth proportional to 8,659.76, 12,989.63 and 3,113.12 is: 4,669.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,659.76 : 12,989.63 = 3,113.12 : x
  2. Step 2: Convert to fraction form
    8,659.76/12,989.63 = 3,113.12/x
  3. Step 3: Cross multiply
    8,659.76x = 12,989.63 × 3,113.12
  4. Step 4: Simplify right side
    8,659.76x = 40,438,219.78
  5. Step 5: Solve for x
    x = 40,438,219.78/8,659.76
  6. Step 6: Final answer
    x = 4,669.67

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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.