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Finding the Fourth Proportional to 212,820.90, 319,035.30 and 72,481.92

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Solution

The fourth proportional to 212,820.90, 319,035.30 and 72,481.92 is: 108,656.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,820.90 : 319,035.30 = 72,481.92 : x
  2. Step 2: Convert to fraction form
    212,820.90/319,035.30 = 72,481.92/x
  3. Step 3: Cross multiply
    212,820.90x = 319,035.30 × 72,481.92
  4. Step 4: Simplify right side
    212,820.90x = 23,124,291,091.78
  5. Step 5: Solve for x
    x = 23,124,291,091.78/212,820.90
  6. Step 6: Final answer
    x = 108,656.11

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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.