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Finding the Fourth Proportional to 750.99, 1,120.75 and 668.98

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Solution

The fourth proportional to 750.99, 1,120.75 and 668.98 is: 998.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    750.99 : 1,120.75 = 668.98 : x
  2. Step 2: Convert to fraction form
    750.99/1,120.75 = 668.98/x
  3. Step 3: Cross multiply
    750.99x = 1,120.75 × 668.98
  4. Step 4: Simplify right side
    750.99x = 749,759.34
  5. Step 5: Solve for x
    x = 749,759.34/750.99
  6. Step 6: Final answer
    x = 998.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.