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Finding the Fourth Proportional to 1,111.35, 1,666.80 and 331.17

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Solution

The fourth proportional to 1,111.35, 1,666.80 and 331.17 is: 496.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.35 : 1,666.80 = 331.17 : x
  2. Step 2: Convert to fraction form
    1,111.35/1,666.80 = 331.17/x
  3. Step 3: Cross multiply
    1,111.35x = 1,666.80 × 331.17
  4. Step 4: Simplify right side
    1,111.35x = 551,994.16
  5. Step 5: Solve for x
    x = 551,994.16/1,111.35
  6. Step 6: Final answer
    x = 496.69

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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.