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Finding the Fourth Proportional to 1,257.02, 1,882.02 and 639.39

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Solution

The fourth proportional to 1,257.02, 1,882.02 and 639.39 is: 957.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.02 : 1,882.02 = 639.39 : x
  2. Step 2: Convert to fraction form
    1,257.02/1,882.02 = 639.39/x
  3. Step 3: Cross multiply
    1,257.02x = 1,882.02 × 639.39
  4. Step 4: Simplify right side
    1,257.02x = 1,203,344.77
  5. Step 5: Solve for x
    x = 1,203,344.77/1,257.02
  6. Step 6: Final answer
    x = 957.30

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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.