Home / 13,143.36-18,138.30-7,175.55

Finding the Fourth Proportional to 13,143.36, 18,138.30 and 7,175.55

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Solution

The fourth proportional to 13,143.36, 18,138.30 and 7,175.55 is: 9,902.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.36 : 18,138.30 = 7,175.55 : x
  2. Step 2: Convert to fraction form
    13,143.36/18,138.30 = 7,175.55/x
  3. Step 3: Cross multiply
    13,143.36x = 18,138.30 × 7,175.55
  4. Step 4: Simplify right side
    13,143.36x = 130,152,278.57
  5. Step 5: Solve for x
    x = 130,152,278.57/13,143.36
  6. Step 6: Final answer
    x = 9,902.51

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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.