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Finding the Fourth Proportional to 659.66, 989.63 and 220.96

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Solution

The fourth proportional to 659.66, 989.63 and 220.96 is: 331.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.66 : 989.63 = 220.96 : x
  2. Step 2: Convert to fraction form
    659.66/989.63 = 220.96/x
  3. Step 3: Cross multiply
    659.66x = 989.63 × 220.96
  4. Step 4: Simplify right side
    659.66x = 218,662.59
  5. Step 5: Solve for x
    x = 218,662.59/659.66
  6. Step 6: Final answer
    x = 331.48

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