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Finding the Fourth Proportional to 668.40, 996.81 and 571.51

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Solution

The fourth proportional to 668.40, 996.81 and 571.51 is: 852.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.40 : 996.81 = 571.51 : x
  2. Step 2: Convert to fraction form
    668.40/996.81 = 571.51/x
  3. Step 3: Cross multiply
    668.40x = 996.81 × 571.51
  4. Step 4: Simplify right side
    668.40x = 569,686.88
  5. Step 5: Solve for x
    x = 569,686.88/668.40
  6. Step 6: Final answer
    x = 852.31

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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.