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Finding the Fourth Proportional to 12,921.18, 17,832.11 and 7,179.32

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Solution

The fourth proportional to 12,921.18, 17,832.11 and 7,179.32 is: 9,907.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,921.18 : 17,832.11 = 7,179.32 : x
  2. Step 2: Convert to fraction form
    12,921.18/17,832.11 = 7,179.32/x
  3. Step 3: Cross multiply
    12,921.18x = 17,832.11 × 7,179.32
  4. Step 4: Simplify right side
    12,921.18x = 128,022,488.01
  5. Step 5: Solve for x
    x = 128,022,488.01/12,921.18
  6. Step 6: Final answer
    x = 9,907.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.