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Finding the Fourth Proportional to 99,090.78, 148,641.04 and 39,918.44

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Solution

The fourth proportional to 99,090.78, 148,641.04 and 39,918.44 is: 59,879.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,090.78 : 148,641.04 = 39,918.44 : x
  2. Step 2: Convert to fraction form
    99,090.78/148,641.04 = 39,918.44/x
  3. Step 3: Cross multiply
    99,090.78x = 148,641.04 × 39,918.44
  4. Step 4: Simplify right side
    99,090.78x = 5,933,518,436.78
  5. Step 5: Solve for x
    x = 5,933,518,436.78/99,090.78
  6. Step 6: Final answer
    x = 59,879.62

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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.