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Finding the Fourth Proportional to 1,297.68, 1,945.12 and 640.02

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Solution

The fourth proportional to 1,297.68, 1,945.12 and 640.02 is: 959.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.68 : 1,945.12 = 640.02 : x
  2. Step 2: Convert to fraction form
    1,297.68/1,945.12 = 640.02/x
  3. Step 3: Cross multiply
    1,297.68x = 1,945.12 × 640.02
  4. Step 4: Simplify right side
    1,297.68x = 1,244,915.70
  5. Step 5: Solve for x
    x = 1,244,915.70/1,297.68
  6. Step 6: Final answer
    x = 959.34

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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.