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Finding the Fourth Proportional to 739.92, 1,111.91 and 712.58

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Solution

The fourth proportional to 739.92, 1,111.91 and 712.58 is: 1,070.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    739.92 : 1,111.91 = 712.58 : x
  2. Step 2: Convert to fraction form
    739.92/1,111.91 = 712.58/x
  3. Step 3: Cross multiply
    739.92x = 1,111.91 × 712.58
  4. Step 4: Simplify right side
    739.92x = 792,315.71
  5. Step 5: Solve for x
    x = 792,315.71/739.92
  6. Step 6: Final answer
    x = 1,070.81

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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.