Home / 10,078.20-15,121.80-3,509.10

Finding the Fourth Proportional to 10,078.20, 15,121.80 and 3,509.10

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Solution

The fourth proportional to 10,078.20, 15,121.80 and 3,509.10 is: 5,265.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,078.20 : 15,121.80 = 3,509.10 : x
  2. Step 2: Convert to fraction form
    10,078.20/15,121.80 = 3,509.10/x
  3. Step 3: Cross multiply
    10,078.20x = 15,121.80 × 3,509.10
  4. Step 4: Simplify right side
    10,078.20x = 53,063,908.38
  5. Step 5: Solve for x
    x = 53,063,908.38/10,078.20
  6. Step 6: Final answer
    x = 5,265.22

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.