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Finding the Fourth Proportional to 911.51, 1,257.58 and 745.66

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Solution

The fourth proportional to 911.51, 1,257.58 and 745.66 is: 1,028.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.51 : 1,257.58 = 745.66 : x
  2. Step 2: Convert to fraction form
    911.51/1,257.58 = 745.66/x
  3. Step 3: Cross multiply
    911.51x = 1,257.58 × 745.66
  4. Step 4: Simplify right side
    911.51x = 937,727.10
  5. Step 5: Solve for x
    x = 937,727.10/911.51
  6. Step 6: Final answer
    x = 1,028.76

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.