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Finding the Fourth Proportional to 751.25, 1,038.89 and 716.87

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Solution

The fourth proportional to 751.25, 1,038.89 and 716.87 is: 991.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.25 : 1,038.89 = 716.87 : x
  2. Step 2: Convert to fraction form
    751.25/1,038.89 = 716.87/x
  3. Step 3: Cross multiply
    751.25x = 1,038.89 × 716.87
  4. Step 4: Simplify right side
    751.25x = 744,745.49
  5. Step 5: Solve for x
    x = 744,745.49/751.25
  6. Step 6: Final answer
    x = 991.34

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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.