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Finding the Fourth Proportional to 12,489.87, 17,236.79 and 7,184.57

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Solution

The fourth proportional to 12,489.87, 17,236.79 and 7,184.57 is: 9,915.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.87 : 17,236.79 = 7,184.57 : x
  2. Step 2: Convert to fraction form
    12,489.87/17,236.79 = 7,184.57/x
  3. Step 3: Cross multiply
    12,489.87x = 17,236.79 × 7,184.57
  4. Step 4: Simplify right side
    12,489.87x = 123,838,924.33
  5. Step 5: Solve for x
    x = 123,838,924.33/12,489.87
  6. Step 6: Final answer
    x = 9,915.15

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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.