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Finding the Fourth Proportional to 668.01, 921.96 and 419.55

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Solution

The fourth proportional to 668.01, 921.96 and 419.55 is: 579.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    668.01 : 921.96 = 419.55 : x
  2. Step 2: Convert to fraction form
    668.01/921.96 = 419.55/x
  3. Step 3: Cross multiply
    668.01x = 921.96 × 419.55
  4. Step 4: Simplify right side
    668.01x = 386,808.32
  5. Step 5: Solve for x
    x = 386,808.32/668.01
  6. Step 6: Final answer
    x = 579.05

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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.