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Finding the Fourth Proportional to 69,135.72, 103,686.30 and 19,887.72

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Solution

The fourth proportional to 69,135.72, 103,686.30 and 19,887.72 is: 29,826.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    69,135.72 : 103,686.30 = 19,887.72 : x
  2. Step 2: Convert to fraction form
    69,135.72/103,686.30 = 19,887.72/x
  3. Step 3: Cross multiply
    69,135.72x = 103,686.30 × 19,887.72
  4. Step 4: Simplify right side
    69,135.72x = 2,062,084,102.24
  5. Step 5: Solve for x
    x = 2,062,084,102.24/69,135.72
  6. Step 6: Final answer
    x = 29,826.61

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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.