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Finding the Fourth Proportional to 10,666.80, 16,019.40 and 10,321.20

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Solution

The fourth proportional to 10,666.80, 16,019.40 and 10,321.20 is: 15,500.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,666.80 : 16,019.40 = 10,321.20 : x
  2. Step 2: Convert to fraction form
    10,666.80/16,019.40 = 10,321.20/x
  3. Step 3: Cross multiply
    10,666.80x = 16,019.40 × 10,321.20
  4. Step 4: Simplify right side
    10,666.80x = 165,339,431.28
  5. Step 5: Solve for x
    x = 165,339,431.28/10,666.80
  6. Step 6: Final answer
    x = 15,500.38

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.