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Finding the Fourth Proportional to 668.02, 921.56 and 419.22

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Solution

The fourth proportional to 668.02, 921.56 and 419.22 is: 578.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.02 : 921.56 = 419.22 : x
  2. Step 2: Convert to fraction form
    668.02/921.56 = 419.22/x
  3. Step 3: Cross multiply
    668.02x = 921.56 × 419.22
  4. Step 4: Simplify right side
    668.02x = 386,336.38
  5. Step 5: Solve for x
    x = 386,336.38/668.02
  6. Step 6: Final answer
    x = 578.33

Related Problems

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Double scale
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Similar ratio
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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.