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Finding the Fourth Proportional to 20,718.57, 31,077.86 and 6,867.57

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Solution

The fourth proportional to 20,718.57, 31,077.86 and 6,867.57 is: 10,301.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,718.57 : 31,077.86 = 6,867.57 : x
  2. Step 2: Convert to fraction form
    20,718.57/31,077.86 = 6,867.57/x
  3. Step 3: Cross multiply
    20,718.57x = 31,077.86 × 6,867.57
  4. Step 4: Simplify right side
    20,718.57x = 213,429,344.66
  5. Step 5: Solve for x
    x = 213,429,344.66/20,718.57
  6. Step 6: Final answer
    x = 10,301.36

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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.