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Finding the Fourth Proportional to 85,607.20, 118,138.20 and 47,879

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Solution

The fourth proportional to 85,607.20, 118,138.20 and 47,879 is: 66,073.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,607.20 : 118,138.20 = 47,879 : x
  2. Step 2: Convert to fraction form
    85,607.20/118,138.20 = 47,879/x
  3. Step 3: Cross multiply
    85,607.20x = 118,138.20 × 47,879
  4. Step 4: Simplify right side
    85,607.20x = 5,656,338,877.80
  5. Step 5: Solve for x
    x = 5,656,338,877.80/85,607.20
  6. Step 6: Final answer
    x = 66,073.17

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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.