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Finding the Fourth Proportional to 11,321.80, 16,990.80 and 6,386.20

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Solution

The fourth proportional to 11,321.80, 16,990.80 and 6,386.20 is: 9,583.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,321.80 : 16,990.80 = 6,386.20 : x
  2. Step 2: Convert to fraction form
    11,321.80/16,990.80 = 6,386.20/x
  3. Step 3: Cross multiply
    11,321.80x = 16,990.80 × 6,386.20
  4. Step 4: Simplify right side
    11,321.80x = 108,506,646.96
  5. Step 5: Solve for x
    x = 108,506,646.96/11,321.80
  6. Step 6: Final answer
    x = 9,583.87

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1.5x scale

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.