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Finding the Fourth Proportional to 67,604.88, 101,420.88 and 20,856

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Solution

The fourth proportional to 67,604.88, 101,420.88 and 20,856 is: 31,288.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,604.88 : 101,420.88 = 20,856 : x
  2. Step 2: Convert to fraction form
    67,604.88/101,420.88 = 20,856/x
  3. Step 3: Cross multiply
    67,604.88x = 101,420.88 × 20,856
  4. Step 4: Simplify right side
    67,604.88x = 2,115,233,873.28
  5. Step 5: Solve for x
    x = 2,115,233,873.28/67,604.88
  6. Step 6: Final answer
    x = 31,288.18

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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.