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Finding the Fourth Proportional to 128,714.80, 192,634.80 and 112,968.40

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Solution

The fourth proportional to 128,714.80, 192,634.80 and 112,968.40 is: 169,068.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,714.80 : 192,634.80 = 112,968.40 : x
  2. Step 2: Convert to fraction form
    128,714.80/192,634.80 = 112,968.40/x
  3. Step 3: Cross multiply
    128,714.80x = 192,634.80 × 112,968.40
  4. Step 4: Simplify right side
    128,714.80x = 21,761,645,140.32
  5. Step 5: Solve for x
    x = 21,761,645,140.32/128,714.80
  6. Step 6: Final answer
    x = 169,068.71

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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.