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Finding the Fourth Proportional to 1,317.62, 1,976.56 and 659.66

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Solution

The fourth proportional to 1,317.62, 1,976.56 and 659.66 is: 989.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.62 : 1,976.56 = 659.66 : x
  2. Step 2: Convert to fraction form
    1,317.62/1,976.56 = 659.66/x
  3. Step 3: Cross multiply
    1,317.62x = 1,976.56 × 659.66
  4. Step 4: Simplify right side
    1,317.62x = 1,303,846.04
  5. Step 5: Solve for x
    x = 1,303,846.04/1,317.62
  6. Step 6: Final answer
    x = 989.54

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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.