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Finding the Fourth Proportional to 1,297.62, 1,946.53 and 639.85

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Solution

The fourth proportional to 1,297.62, 1,946.53 and 639.85 is: 959.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.62 : 1,946.53 = 639.85 : x
  2. Step 2: Convert to fraction form
    1,297.62/1,946.53 = 639.85/x
  3. Step 3: Cross multiply
    1,297.62x = 1,946.53 × 639.85
  4. Step 4: Simplify right side
    1,297.62x = 1,245,487.22
  5. Step 5: Solve for x
    x = 1,245,487.22/1,297.62
  6. Step 6: Final answer
    x = 959.82

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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.