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Finding the Fourth Proportional to 7,806.80, 11,697.40 and 6,501.20

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Solution

The fourth proportional to 7,806.80, 11,697.40 and 6,501.20 is: 9,741.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,806.80 : 11,697.40 = 6,501.20 : x
  2. Step 2: Convert to fraction form
    7,806.80/11,697.40 = 6,501.20/x
  3. Step 3: Cross multiply
    7,806.80x = 11,697.40 × 6,501.20
  4. Step 4: Simplify right side
    7,806.80x = 76,047,136.88
  5. Step 5: Solve for x
    x = 76,047,136.88/7,806.80
  6. Step 6: Final answer
    x = 9,741.14

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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.