Home / 13,143.79-18,138.83-7,479.35

Finding the Fourth Proportional to 13,143.79, 18,138.83 and 7,479.35

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Solution

The fourth proportional to 13,143.79, 18,138.83 and 7,479.35 is: 10,321.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.79 : 18,138.83 = 7,479.35 : x
  2. Step 2: Convert to fraction form
    13,143.79/18,138.83 = 7,479.35/x
  3. Step 3: Cross multiply
    13,143.79x = 18,138.83 × 7,479.35
  4. Step 4: Simplify right side
    13,143.79x = 135,666,722.21
  5. Step 5: Solve for x
    x = 135,666,722.21/13,143.79
  6. Step 6: Final answer
    x = 10,321.74

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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.