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Finding the Fourth Proportional to 1,111.31, 1,666.77 and 331.29

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Solution

The fourth proportional to 1,111.31, 1,666.77 and 331.29 is: 496.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.31 : 1,666.77 = 331.29 : x
  2. Step 2: Convert to fraction form
    1,111.31/1,666.77 = 331.29/x
  3. Step 3: Cross multiply
    1,111.31x = 1,666.77 × 331.29
  4. Step 4: Simplify right side
    1,111.31x = 552,184.23
  5. Step 5: Solve for x
    x = 552,184.23/1,111.31
  6. Step 6: Final answer
    x = 496.88

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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.