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Finding the Fourth Proportional to 1,253.37, 1,881.20 and 668.87

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Solution

The fourth proportional to 1,253.37, 1,881.20 and 668.87 is: 1,003.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.37 : 1,881.20 = 668.87 : x
  2. Step 2: Convert to fraction form
    1,253.37/1,881.20 = 668.87/x
  3. Step 3: Cross multiply
    1,253.37x = 1,881.20 × 668.87
  4. Step 4: Simplify right side
    1,253.37x = 1,258,265.49
  5. Step 5: Solve for x
    x = 1,258,265.49/1,253.37
  6. Step 6: Final answer
    x = 1,003.91

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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.