Home / 20,711.26-31,066.53-5,128.84

Finding the Fourth Proportional to 20,711.26, 31,066.53 and 5,128.84

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Solution

The fourth proportional to 20,711.26, 31,066.53 and 5,128.84 is: 7,693.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.26 : 31,066.53 = 5,128.84 : x
  2. Step 2: Convert to fraction form
    20,711.26/31,066.53 = 5,128.84/x
  3. Step 3: Cross multiply
    20,711.26x = 31,066.53 × 5,128.84
  4. Step 4: Simplify right side
    20,711.26x = 159,335,261.73
  5. Step 5: Solve for x
    x = 159,335,261.73/20,711.26
  6. Step 6: Final answer
    x = 7,693.17

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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.