Home / 13,143.87-18,138.31-7,478.50

Finding the Fourth Proportional to 13,143.87, 18,138.31 and 7,478.50

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Solution

The fourth proportional to 13,143.87, 18,138.31 and 7,478.50 is: 10,320.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,143.87 : 18,138.31 = 7,478.50 : x
  2. Step 2: Convert to fraction form
    13,143.87/18,138.31 = 7,478.50/x
  3. Step 3: Cross multiply
    13,143.87x = 18,138.31 × 7,478.50
  4. Step 4: Simplify right side
    13,143.87x = 135,647,287.29
  5. Step 5: Solve for x
    x = 135,647,287.29/13,143.87
  6. Step 6: Final answer
    x = 10,320.19

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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.