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Finding the Fourth Proportional to 751.88, 1,112.48 and 749.72

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Solution

The fourth proportional to 751.88, 1,112.48 and 749.72 is: 1,109.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.88 : 1,112.48 = 749.72 : x
  2. Step 2: Convert to fraction form
    751.88/1,112.48 = 749.72/x
  3. Step 3: Cross multiply
    751.88x = 1,112.48 × 749.72
  4. Step 4: Simplify right side
    751.88x = 834,048.51
  5. Step 5: Solve for x
    x = 834,048.51/751.88
  6. Step 6: Final answer
    x = 1,109.28

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.