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Finding the Fourth Proportional to 281,319, 421,978.50 and 84,327

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Solution

The fourth proportional to 281,319, 421,978.50 and 84,327 is: 126,490.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,319 : 421,978.50 = 84,327 : x
  2. Step 2: Convert to fraction form
    281,319/421,978.50 = 84,327/x
  3. Step 3: Cross multiply
    281,319x = 421,978.50 × 84,327
  4. Step 4: Simplify right side
    281,319x = 35,584,180,969.50
  5. Step 5: Solve for x
    x = 35,584,180,969.50/281,319
  6. Step 6: Final answer
    x = 126,490.50

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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.