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Finding the Fourth Proportional to 74,558.88, 102,879.32 and 42,721.83

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Solution

The fourth proportional to 74,558.88, 102,879.32 and 42,721.83 is: 58,949.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,558.88 : 102,879.32 = 42,721.83 : x
  2. Step 2: Convert to fraction form
    74,558.88/102,879.32 = 42,721.83/x
  3. Step 3: Cross multiply
    74,558.88x = 102,879.32 × 42,721.83
  4. Step 4: Simplify right side
    74,558.88x = 4,395,192,605.95
  5. Step 5: Solve for x
    x = 4,395,192,605.95/74,558.88
  6. Step 6: Final answer
    x = 58,949.28

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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.