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Finding the Fourth Proportional to 99,187.62, 136,878.44 and 53,865.21

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Solution

The fourth proportional to 99,187.62, 136,878.44 and 53,865.21 is: 74,333.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,187.62 : 136,878.44 = 53,865.21 : x
  2. Step 2: Convert to fraction form
    99,187.62/136,878.44 = 53,865.21/x
  3. Step 3: Cross multiply
    99,187.62x = 136,878.44 × 53,865.21
  4. Step 4: Simplify right side
    99,187.62x = 7,372,985,645.75
  5. Step 5: Solve for x
    x = 7,372,985,645.75/99,187.62
  6. Step 6: Final answer
    x = 74,333.73

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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.