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Finding the Fourth Proportional to 128,879.83, 193,396.29 and 69,714.19

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Solution

The fourth proportional to 128,879.83, 193,396.29 and 69,714.19 is: 104,612.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,879.83 : 193,396.29 = 69,714.19 : x
  2. Step 2: Convert to fraction form
    128,879.83/193,396.29 = 69,714.19/x
  3. Step 3: Cross multiply
    128,879.83x = 193,396.29 × 69,714.19
  4. Step 4: Simplify right side
    128,879.83x = 13,482,465,706.36
  5. Step 5: Solve for x
    x = 13,482,465,706.36/128,879.83
  6. Step 6: Final answer
    x = 104,612.69

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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.