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Finding the Fourth Proportional to 659.77, 990.17 and 654.65

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Solution

The fourth proportional to 659.77, 990.17 and 654.65 is: 982.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    659.77 : 990.17 = 654.65 : x
  2. Step 2: Convert to fraction form
    659.77/990.17 = 654.65/x
  3. Step 3: Cross multiply
    659.77x = 990.17 × 654.65
  4. Step 4: Simplify right side
    659.77x = 648,212.73
  5. Step 5: Solve for x
    x = 648,212.73/659.77
  6. Step 6: Final answer
    x = 982.49

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Double scale
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Similar ratio
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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.