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Finding the Fourth Proportional to 1,112.64, 1,667.67 and 747.30

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Solution

The fourth proportional to 1,112.64, 1,667.67 and 747.30 is: 1,120.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112.64 : 1,667.67 = 747.30 : x
  2. Step 2: Convert to fraction form
    1,112.64/1,667.67 = 747.30/x
  3. Step 3: Cross multiply
    1,112.64x = 1,667.67 × 747.30
  4. Step 4: Simplify right side
    1,112.64x = 1,246,249.79
  5. Step 5: Solve for x
    x = 1,246,249.79/1,112.64
  6. Step 6: Final answer
    x = 1,120.08

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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.