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Finding the Fourth Proportional to 667.40, 921.30 and 434.92

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Solution

The fourth proportional to 667.40, 921.30 and 434.92 is: 600.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.40 : 921.30 = 434.92 : x
  2. Step 2: Convert to fraction form
    667.40/921.30 = 434.92/x
  3. Step 3: Cross multiply
    667.40x = 921.30 × 434.92
  4. Step 4: Simplify right side
    667.40x = 400,691.80
  5. Step 5: Solve for x
    x = 400,691.80/667.40
  6. Step 6: Final answer
    x = 600.38

Related Problems

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Half scale
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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.