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Finding the Fourth Proportional to 76,879.80, 115,319.70 and 47,201.40

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Solution

The fourth proportional to 76,879.80, 115,319.70 and 47,201.40 is: 70,802.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,879.80 : 115,319.70 = 47,201.40 : x
  2. Step 2: Convert to fraction form
    76,879.80/115,319.70 = 47,201.40/x
  3. Step 3: Cross multiply
    76,879.80x = 115,319.70 × 47,201.40
  4. Step 4: Simplify right side
    76,879.80x = 5,443,251,287.58
  5. Step 5: Solve for x
    x = 5,443,251,287.58/76,879.80
  6. Step 6: Final answer
    x = 70,802.10

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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.