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Finding the Fourth Proportional to 272,971.20, 409,383.90 and 83,431.20

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Solution

The fourth proportional to 272,971.20, 409,383.90 and 83,431.20 is: 125,124.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,971.20 : 409,383.90 = 83,431.20 : x
  2. Step 2: Convert to fraction form
    272,971.20/409,383.90 = 83,431.20/x
  3. Step 3: Cross multiply
    272,971.20x = 409,383.90 × 83,431.20
  4. Step 4: Simplify right side
    272,971.20x = 34,155,390,037.68
  5. Step 5: Solve for x
    x = 34,155,390,037.68/272,971.20
  6. Step 6: Final answer
    x = 125,124.52

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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.