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Finding the Fourth Proportional to 10,918.80, 16,358.76 and 5,065.20

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Solution

The fourth proportional to 10,918.80, 16,358.76 and 5,065.20 is: 7,588.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,918.80 : 16,358.76 = 5,065.20 : x
  2. Step 2: Convert to fraction form
    10,918.80/16,358.76 = 5,065.20/x
  3. Step 3: Cross multiply
    10,918.80x = 16,358.76 × 5,065.20
  4. Step 4: Simplify right side
    10,918.80x = 82,860,391.15
  5. Step 5: Solve for x
    x = 82,860,391.15/10,918.80
  6. Step 6: Final answer
    x = 7,588.78

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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.