Home / 13,143.33-18,139.38-7,479.45

Finding the Fourth Proportional to 13,143.33, 18,139.38 and 7,479.45

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Solution

The fourth proportional to 13,143.33, 18,139.38 and 7,479.45 is: 10,322.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.33 : 18,139.38 = 7,479.45 : x
  2. Step 2: Convert to fraction form
    13,143.33/18,139.38 = 7,479.45/x
  3. Step 3: Cross multiply
    13,143.33x = 18,139.38 × 7,479.45
  4. Step 4: Simplify right side
    13,143.33x = 135,672,585.74
  5. Step 5: Solve for x
    x = 135,672,585.74/13,143.33
  6. Step 6: Final answer
    x = 10,322.54

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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.