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Finding the Fourth Proportional to 69,158.86, 103,753.84 and 21,131.66

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Solution

The fourth proportional to 69,158.86, 103,753.84 and 21,131.66 is: 31,702.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,158.86 : 103,753.84 = 21,131.66 : x
  2. Step 2: Convert to fraction form
    69,158.86/103,753.84 = 21,131.66/x
  3. Step 3: Cross multiply
    69,158.86x = 103,753.84 × 21,131.66
  4. Step 4: Simplify right side
    69,158.86x = 2,192,490,899.24
  5. Step 5: Solve for x
    x = 2,192,490,899.24/69,158.86
  6. Step 6: Final answer
    x = 31,702.24

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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.