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Finding the Fourth Proportional to 603.50, 905.42 and 213.60

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Solution

The fourth proportional to 603.50, 905.42 and 213.60 is: 320.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    603.50 : 905.42 = 213.60 : x
  2. Step 2: Convert to fraction form
    603.50/905.42 = 213.60/x
  3. Step 3: Cross multiply
    603.50x = 905.42 × 213.60
  4. Step 4: Simplify right side
    603.50x = 193,392.12
  5. Step 5: Solve for x
    x = 193,392.12/603.50
  6. Step 6: Final answer
    x = 320.45

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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.