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Finding the Fourth Proportional to 1,111.45, 1,667.45 and 418.19

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Solution

The fourth proportional to 1,111.45, 1,667.45 and 418.19 is: 627.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.45 : 1,667.45 = 418.19 : x
  2. Step 2: Convert to fraction form
    1,111.45/1,667.45 = 418.19/x
  3. Step 3: Cross multiply
    1,111.45x = 1,667.45 × 418.19
  4. Step 4: Simplify right side
    1,111.45x = 697,310.92
  5. Step 5: Solve for x
    x = 697,310.92/1,111.45
  6. Step 6: Final answer
    x = 627.39

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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.