Home / 13,218.68-18,235.49-7,912.47

Finding the Fourth Proportional to 13,218.68, 18,235.49 and 7,912.47

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Solution

The fourth proportional to 13,218.68, 18,235.49 and 7,912.47 is: 10,915.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,218.68 : 18,235.49 = 7,912.47 : x
  2. Step 2: Convert to fraction form
    13,218.68/18,235.49 = 7,912.47/x
  3. Step 3: Cross multiply
    13,218.68x = 18,235.49 × 7,912.47
  4. Step 4: Simplify right side
    13,218.68x = 144,287,767.56
  5. Step 5: Solve for x
    x = 144,287,767.56/13,218.68
  6. Step 6: Final answer
    x = 10,915.44

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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.