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Finding the Fourth Proportional to 21,769.40, 32,668.66 and 7,918.40

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Solution

The fourth proportional to 21,769.40, 32,668.66 and 7,918.40 is: 11,882.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,769.40 : 32,668.66 = 7,918.40 : x
  2. Step 2: Convert to fraction form
    21,769.40/32,668.66 = 7,918.40/x
  3. Step 3: Cross multiply
    21,769.40x = 32,668.66 × 7,918.40
  4. Step 4: Simplify right side
    21,769.40x = 258,683,528.17
  5. Step 5: Solve for x
    x = 258,683,528.17/21,769.40
  6. Step 6: Final answer
    x = 11,882.90

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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.