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Finding the Fourth Proportional to 108,714.80, 163,072.20 and 91,218.80

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Solution

The fourth proportional to 108,714.80, 163,072.20 and 91,218.80 is: 136,828.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,714.80 : 163,072.20 = 91,218.80 : x
  2. Step 2: Convert to fraction form
    108,714.80/163,072.20 = 91,218.80/x
  3. Step 3: Cross multiply
    108,714.80x = 163,072.20 × 91,218.80
  4. Step 4: Simplify right side
    108,714.80x = 14,875,250,397.36
  5. Step 5: Solve for x
    x = 14,875,250,397.36/108,714.80
  6. Step 6: Final answer
    x = 136,828.20

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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.