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Finding the Fourth Proportional to 84,815.20, 127,139.10 and 47,393.20

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Solution

The fourth proportional to 84,815.20, 127,139.10 and 47,393.20 is: 71,043.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,815.20 : 127,139.10 = 47,393.20 : x
  2. Step 2: Convert to fraction form
    84,815.20/127,139.10 = 47,393.20/x
  3. Step 3: Cross multiply
    84,815.20x = 127,139.10 × 47,393.20
  4. Step 4: Simplify right side
    84,815.20x = 6,025,528,794.12
  5. Step 5: Solve for x
    x = 6,025,528,794.12/84,815.20
  6. Step 6: Final answer
    x = 71,043.03

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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.