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Finding the Fourth Proportional to 889.31, 1,333.78 and 239.89

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Solution

The fourth proportional to 889.31, 1,333.78 and 239.89 is: 359.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.31 : 1,333.78 = 239.89 : x
  2. Step 2: Convert to fraction form
    889.31/1,333.78 = 239.89/x
  3. Step 3: Cross multiply
    889.31x = 1,333.78 × 239.89
  4. Step 4: Simplify right side
    889.31x = 319,955.95
  5. Step 5: Solve for x
    x = 319,955.95/889.31
  6. Step 6: Final answer
    x = 359.78

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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.