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Finding the Fourth Proportional to 11,813.20, 17,719.80 and 7,205.20

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Solution

The fourth proportional to 11,813.20, 17,719.80 and 7,205.20 is: 10,807.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,813.20 : 17,719.80 = 7,205.20 : x
  2. Step 2: Convert to fraction form
    11,813.20/17,719.80 = 7,205.20/x
  3. Step 3: Cross multiply
    11,813.20x = 17,719.80 × 7,205.20
  4. Step 4: Simplify right side
    11,813.20x = 127,674,702.96
  5. Step 5: Solve for x
    x = 127,674,702.96/11,813.20
  6. Step 6: Final answer
    x = 10,807.80

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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.