Home / 20,712.78-31,069.17-5,130.42

Finding the Fourth Proportional to 20,712.78, 31,069.17 and 5,130.42

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Solution

The fourth proportional to 20,712.78, 31,069.17 and 5,130.42 is: 7,695.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.78 : 31,069.17 = 5,130.42 : x
  2. Step 2: Convert to fraction form
    20,712.78/31,069.17 = 5,130.42/x
  3. Step 3: Cross multiply
    20,712.78x = 31,069.17 × 5,130.42
  4. Step 4: Simplify right side
    20,712.78x = 159,397,891.15
  5. Step 5: Solve for x
    x = 159,397,891.15/20,712.78
  6. Step 6: Final answer
    x = 7,695.63

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1.5x scale

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.