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Finding the Fourth Proportional to 70,999.78, 97,979.69 and 39,168.68

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Solution

The fourth proportional to 70,999.78, 97,979.69 and 39,168.68 is: 54,052.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,999.78 : 97,979.69 = 39,168.68 : x
  2. Step 2: Convert to fraction form
    70,999.78/97,979.69 = 39,168.68/x
  3. Step 3: Cross multiply
    70,999.78x = 97,979.69 × 39,168.68
  4. Step 4: Simplify right side
    70,999.78x = 3,837,734,438.37
  5. Step 5: Solve for x
    x = 3,837,734,438.37/70,999.78
  6. Step 6: Final answer
    x = 54,052.77

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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.