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Finding the Fourth Proportional to 108,028.80, 161,848.80 and 91,310.40

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Solution

The fourth proportional to 108,028.80, 161,848.80 and 91,310.40 is: 136,801.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,028.80 : 161,848.80 = 91,310.40 : x
  2. Step 2: Convert to fraction form
    108,028.80/161,848.80 = 91,310.40/x
  3. Step 3: Cross multiply
    108,028.80x = 161,848.80 × 91,310.40
  4. Step 4: Simplify right side
    108,028.80x = 14,778,478,667.52
  5. Step 5: Solve for x
    x = 14,778,478,667.52/108,028.80
  6. Step 6: Final answer
    x = 136,801.29

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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.