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Finding the Fourth Proportional to 9,806.80, 14,688.60 and 6,869.20

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Solution

The fourth proportional to 9,806.80, 14,688.60 and 6,869.20 is: 10,288.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,806.80 : 14,688.60 = 6,869.20 : x
  2. Step 2: Convert to fraction form
    9,806.80/14,688.60 = 6,869.20/x
  3. Step 3: Cross multiply
    9,806.80x = 14,688.60 × 6,869.20
  4. Step 4: Simplify right side
    9,806.80x = 100,898,931.12
  5. Step 5: Solve for x
    x = 100,898,931.12/9,806.80
  6. Step 6: Final answer
    x = 10,288.67

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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.