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Finding the Fourth Proportional to 761.21, 1,136.30 and 668.94

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Solution

The fourth proportional to 761.21, 1,136.30 and 668.94 is: 998.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.21 : 1,136.30 = 668.94 : x
  2. Step 2: Convert to fraction form
    761.21/1,136.30 = 668.94/x
  3. Step 3: Cross multiply
    761.21x = 1,136.30 × 668.94
  4. Step 4: Simplify right side
    761.21x = 760,119.36
  5. Step 5: Solve for x
    x = 760,119.36/761.21
  6. Step 6: Final answer
    x = 998.57

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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.