Home / 20,670.13-31,005.21-5,087.75

Finding the Fourth Proportional to 20,670.13, 31,005.21 and 5,087.75

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Solution

The fourth proportional to 20,670.13, 31,005.21 and 5,087.75 is: 7,631.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,670.13 : 31,005.21 = 5,087.75 : x
  2. Step 2: Convert to fraction form
    20,670.13/31,005.21 = 5,087.75/x
  3. Step 3: Cross multiply
    20,670.13x = 31,005.21 × 5,087.75
  4. Step 4: Simplify right side
    20,670.13x = 157,746,757.18
  5. Step 5: Solve for x
    x = 157,746,757.18/20,670.13
  6. Step 6: Final answer
    x = 7,631.63

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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.