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Finding the Fourth Proportional to 668.65, 922.26 and 479.42

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Solution

The fourth proportional to 668.65, 922.26 and 479.42 is: 661.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.65 : 922.26 = 479.42 : x
  2. Step 2: Convert to fraction form
    668.65/922.26 = 479.42/x
  3. Step 3: Cross multiply
    668.65x = 922.26 × 479.42
  4. Step 4: Simplify right side
    668.65x = 442,149.89
  5. Step 5: Solve for x
    x = 442,149.89/668.65
  6. Step 6: Final answer
    x = 661.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.