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Finding the Fourth Proportional to 108,081.40, 161,805.30 and 76,977.40

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Solution

The fourth proportional to 108,081.40, 161,805.30 and 76,977.40 is: 115,240.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,081.40 : 161,805.30 = 76,977.40 : x
  2. Step 2: Convert to fraction form
    108,081.40/161,805.30 = 76,977.40/x
  3. Step 3: Cross multiply
    108,081.40x = 161,805.30 × 76,977.40
  4. Step 4: Simplify right side
    108,081.40x = 12,455,351,300.22
  5. Step 5: Solve for x
    x = 12,455,351,300.22/108,081.40
  6. Step 6: Final answer
    x = 115,240.47

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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.