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Finding the Fourth Proportional to 668.42, 921.56 and 556.38

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Solution

The fourth proportional to 668.42, 921.56 and 556.38 is: 767.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.42 : 921.56 = 556.38 : x
  2. Step 2: Convert to fraction form
    668.42/921.56 = 556.38/x
  3. Step 3: Cross multiply
    668.42x = 921.56 × 556.38
  4. Step 4: Simplify right side
    668.42x = 512,737.55
  5. Step 5: Solve for x
    x = 512,737.55/668.42
  6. Step 6: Final answer
    x = 767.09

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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.