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Finding the Fourth Proportional to 751.24, 1,127.66 and 665.11

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Solution

The fourth proportional to 751.24, 1,127.66 and 665.11 is: 998.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    751.24 : 1,127.66 = 665.11 : x
  2. Step 2: Convert to fraction form
    751.24/1,127.66 = 665.11/x
  3. Step 3: Cross multiply
    751.24x = 1,127.66 × 665.11
  4. Step 4: Simplify right side
    751.24x = 750,017.94
  5. Step 5: Solve for x
    x = 750,017.94/751.24
  6. Step 6: Final answer
    x = 998.37

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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.