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Finding the Fourth Proportional to 742.44, 1,111.35 and 394.92

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Solution

The fourth proportional to 742.44, 1,111.35 and 394.92 is: 591.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    742.44 : 1,111.35 = 394.92 : x
  2. Step 2: Convert to fraction form
    742.44/1,111.35 = 394.92/x
  3. Step 3: Cross multiply
    742.44x = 1,111.35 × 394.92
  4. Step 4: Simplify right side
    742.44x = 438,894.34
  5. Step 5: Solve for x
    x = 438,894.34/742.44
  6. Step 6: Final answer
    x = 591.15

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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.