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Finding the Fourth Proportional to 101,388.78, 152,070.21 and 42,213.42

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Solution

The fourth proportional to 101,388.78, 152,070.21 and 42,213.42 is: 63,314.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    101,388.78 : 152,070.21 = 42,213.42 : x
  2. Step 2: Convert to fraction form
    101,388.78/152,070.21 = 42,213.42/x
  3. Step 3: Cross multiply
    101,388.78x = 152,070.21 × 42,213.42
  4. Step 4: Simplify right side
    101,388.78x = 6,419,403,644.22
  5. Step 5: Solve for x
    x = 6,419,403,644.22/101,388.78
  6. Step 6: Final answer
    x = 63,314.73

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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.