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Finding the Fourth Proportional to 1,111.70, 1,667.78 and 418.37

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Solution

The fourth proportional to 1,111.70, 1,667.78 and 418.37 is: 627.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,111.70 : 1,667.78 = 418.37 : x
  2. Step 2: Convert to fraction form
    1,111.70/1,667.78 = 418.37/x
  3. Step 3: Cross multiply
    1,111.70x = 1,667.78 × 418.37
  4. Step 4: Simplify right side
    1,111.70x = 697,749.12
  5. Step 5: Solve for x
    x = 697,749.12/1,111.70
  6. Step 6: Final answer
    x = 627.64

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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.