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Finding the Fourth Proportional to 85,612.54, 118,138.89 and 47,879.50

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Solution

The fourth proportional to 85,612.54, 118,138.89 and 47,879.50 is: 66,070.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,612.54 : 118,138.89 = 47,879.50 : x
  2. Step 2: Convert to fraction form
    85,612.54/118,138.89 = 47,879.50/x
  3. Step 3: Cross multiply
    85,612.54x = 118,138.89 × 47,879.50
  4. Step 4: Simplify right side
    85,612.54x = 5,656,430,983.76
  5. Step 5: Solve for x
    x = 5,656,430,983.76/85,612.54
  6. Step 6: Final answer
    x = 66,070.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.