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Finding the Fourth Proportional to 68,879.64, 103,155.42 and 47,840.70

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Solution

The fourth proportional to 68,879.64, 103,155.42 and 47,840.70 is: 71,647.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,879.64 : 103,155.42 = 47,840.70 : x
  2. Step 2: Convert to fraction form
    68,879.64/103,155.42 = 47,840.70/x
  3. Step 3: Cross multiply
    68,879.64x = 103,155.42 × 47,840.70
  4. Step 4: Simplify right side
    68,879.64x = 4,935,027,501.59
  5. Step 5: Solve for x
    x = 4,935,027,501.59/68,879.64
  6. Step 6: Final answer
    x = 71,647.12

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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.