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Finding the Fourth Proportional to 12,489.64, 17,235.22 and 7,180.84

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Solution

The fourth proportional to 12,489.64, 17,235.22 and 7,180.84 is: 9,909.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.64 : 17,235.22 = 7,180.84 : x
  2. Step 2: Convert to fraction form
    12,489.64/17,235.22 = 7,180.84/x
  3. Step 3: Cross multiply
    12,489.64x = 17,235.22 × 7,180.84
  4. Step 4: Simplify right side
    12,489.64x = 123,763,357.18
  5. Step 5: Solve for x
    x = 123,763,357.18/12,489.64
  6. Step 6: Final answer
    x = 9,909.28

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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.