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Finding the Fourth Proportional to 56,872.72, 85,281 and 17,420.32

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Solution

The fourth proportional to 56,872.72, 85,281 and 17,420.32 is: 26,121.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    56,872.72 : 85,281 = 17,420.32 : x
  2. Step 2: Convert to fraction form
    56,872.72/85,281 = 17,420.32/x
  3. Step 3: Cross multiply
    56,872.72x = 85,281 × 17,420.32
  4. Step 4: Simplify right side
    56,872.72x = 1,485,622,309.92
  5. Step 5: Solve for x
    x = 1,485,622,309.92/56,872.72
  6. Step 6: Final answer
    x = 26,121.88

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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.