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Finding the Fourth Proportional to 741.13, 1,111.70 and 355.21

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Solution

The fourth proportional to 741.13, 1,111.70 and 355.21 is: 532.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.13 : 1,111.70 = 355.21 : x
  2. Step 2: Convert to fraction form
    741.13/1,111.70 = 355.21/x
  3. Step 3: Cross multiply
    741.13x = 1,111.70 × 355.21
  4. Step 4: Simplify right side
    741.13x = 394,886.96
  5. Step 5: Solve for x
    x = 394,886.96/741.13
  6. Step 6: Final answer
    x = 532.82

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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.