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Finding the Fourth Proportional to 761.05, 1,136.07 and 668.79

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Solution

The fourth proportional to 761.05, 1,136.07 and 668.79 is: 998.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.05 : 1,136.07 = 668.79 : x
  2. Step 2: Convert to fraction form
    761.05/1,136.07 = 668.79/x
  3. Step 3: Cross multiply
    761.05x = 1,136.07 × 668.79
  4. Step 4: Simplify right side
    761.05x = 759,785.49
  5. Step 5: Solve for x
    x = 759,785.49/761.05
  6. Step 6: Final answer
    x = 998.34

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1.5x scale

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.