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Finding the Fourth Proportional to 84,875.68, 127,310.28 and 28,720

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Solution

The fourth proportional to 84,875.68, 127,310.28 and 28,720 is: 43,078.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,875.68 : 127,310.28 = 28,720 : x
  2. Step 2: Convert to fraction form
    84,875.68/127,310.28 = 28,720/x
  3. Step 3: Cross multiply
    84,875.68x = 127,310.28 × 28,720
  4. Step 4: Simplify right side
    84,875.68x = 3,656,351,241.60
  5. Step 5: Solve for x
    x = 3,656,351,241.60/84,875.68
  6. Step 6: Final answer
    x = 43,078.90

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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.