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Finding the Fourth Proportional to 85,212.20, 127,818.30 and 53,719.40

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Solution

The fourth proportional to 85,212.20, 127,818.30 and 53,719.40 is: 80,579.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,212.20 : 127,818.30 = 53,719.40 : x
  2. Step 2: Convert to fraction form
    85,212.20/127,818.30 = 53,719.40/x
  3. Step 3: Cross multiply
    85,212.20x = 127,818.30 × 53,719.40
  4. Step 4: Simplify right side
    85,212.20x = 6,866,322,385.02
  5. Step 5: Solve for x
    x = 6,866,322,385.02/85,212.20
  6. Step 6: Final answer
    x = 80,579.10

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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.