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Finding the Fourth Proportional to 108,388.20, 162,290.70 and 84,865.80

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Solution

The fourth proportional to 108,388.20, 162,290.70 and 84,865.80 is: 127,070.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,388.20 : 162,290.70 = 84,865.80 : x
  2. Step 2: Convert to fraction form
    108,388.20/162,290.70 = 84,865.80/x
  3. Step 3: Cross multiply
    108,388.20x = 162,290.70 × 84,865.80
  4. Step 4: Simplify right side
    108,388.20x = 13,772,930,088.06
  5. Step 5: Solve for x
    x = 13,772,930,088.06/108,388.20
  6. Step 6: Final answer
    x = 127,070.38

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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.