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Finding the Fourth Proportional to 668.45, 921.97 and 482.55

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Solution

The fourth proportional to 668.45, 921.97 and 482.55 is: 665.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.45 : 921.97 = 482.55 : x
  2. Step 2: Convert to fraction form
    668.45/921.97 = 482.55/x
  3. Step 3: Cross multiply
    668.45x = 921.97 × 482.55
  4. Step 4: Simplify right side
    668.45x = 444,894.21
  5. Step 5: Solve for x
    x = 444,894.21/668.45
  6. Step 6: Final answer
    x = 665.57

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1.5x scale

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.