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Finding the Fourth Proportional to 10,918.80, 16,378.20 and 4,681.80

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Solution

The fourth proportional to 10,918.80, 16,378.20 and 4,681.80 is: 7,022.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,918.80 : 16,378.20 = 4,681.80 : x
  2. Step 2: Convert to fraction form
    10,918.80/16,378.20 = 4,681.80/x
  3. Step 3: Cross multiply
    10,918.80x = 16,378.20 × 4,681.80
  4. Step 4: Simplify right side
    10,918.80x = 76,679,456.76
  5. Step 5: Solve for x
    x = 76,679,456.76/10,918.80
  6. Step 6: Final answer
    x = 7,022.70

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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.