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Finding the Fourth Proportional to 108,425.40, 162,321.30 and 77,321.40

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Solution

The fourth proportional to 108,425.40, 162,321.30 and 77,321.40 is: 115,756.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,425.40 : 162,321.30 = 77,321.40 : x
  2. Step 2: Convert to fraction form
    108,425.40/162,321.30 = 77,321.40/x
  3. Step 3: Cross multiply
    108,425.40x = 162,321.30 × 77,321.40
  4. Step 4: Simplify right side
    108,425.40x = 12,550,910,165.82
  5. Step 5: Solve for x
    x = 12,550,910,165.82/108,425.40
  6. Step 6: Final answer
    x = 115,756.18

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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.