Home / 13,147.20-18,142.32-7,178.51

Finding the Fourth Proportional to 13,147.20, 18,142.32 and 7,178.51

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Solution

The fourth proportional to 13,147.20, 18,142.32 and 7,178.51 is: 9,905.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,147.20 : 18,142.32 = 7,178.51 : x
  2. Step 2: Convert to fraction form
    13,147.20/18,142.32 = 7,178.51/x
  3. Step 3: Cross multiply
    13,147.20x = 18,142.32 × 7,178.51
  4. Step 4: Simplify right side
    13,147.20x = 130,234,825.54
  5. Step 5: Solve for x
    x = 130,234,825.54/13,147.20
  6. Step 6: Final answer
    x = 9,905.90

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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.