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Finding the Fourth Proportional to 889, 1,333.50 and 281

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Solution

The fourth proportional to 889, 1,333.50 and 281 is: 421.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    889 : 1,333.50 = 281 : x
  2. Step 2: Convert to fraction form
    889/1,333.50 = 281/x
  3. Step 3: Cross multiply
    889x = 1,333.50 × 281
  4. Step 4: Simplify right side
    889x = 374,713.50
  5. Step 5: Solve for x
    x = 374,713.50/889
  6. Step 6: Final answer
    x = 421.50

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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.