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Finding the Fourth Proportional to 1,111.25, 1,666.80 and 331.25

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Solution

The fourth proportional to 1,111.25, 1,666.80 and 331.25 is: 496.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.25 : 1,666.80 = 331.25 : x
  2. Step 2: Convert to fraction form
    1,111.25/1,666.80 = 331.25/x
  3. Step 3: Cross multiply
    1,111.25x = 1,666.80 × 331.25
  4. Step 4: Simplify right side
    1,111.25x = 552,131.67
  5. Step 5: Solve for x
    x = 552,131.67/1,111.25
  6. Step 6: Final answer
    x = 496.86

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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.