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Finding the Fourth Proportional to 744.43, 1,115.15 and 354.81

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Solution

The fourth proportional to 744.43, 1,115.15 and 354.81 is: 531.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    744.43 : 1,115.15 = 354.81 : x
  2. Step 2: Convert to fraction form
    744.43/1,115.15 = 354.81/x
  3. Step 3: Cross multiply
    744.43x = 1,115.15 × 354.81
  4. Step 4: Simplify right side
    744.43x = 395,659.91
  5. Step 5: Solve for x
    x = 395,659.91/744.43
  6. Step 6: Final answer
    x = 531.50

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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.