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Finding the Fourth Proportional to 1,255.16, 1,883.50 and 639.40

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Solution

The fourth proportional to 1,255.16, 1,883.50 and 639.40 is: 959.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,255.16 : 1,883.50 = 639.40 : x
  2. Step 2: Convert to fraction form
    1,255.16/1,883.50 = 639.40/x
  3. Step 3: Cross multiply
    1,255.16x = 1,883.50 × 639.40
  4. Step 4: Simplify right side
    1,255.16x = 1,204,309.90
  5. Step 5: Solve for x
    x = 1,204,309.90/1,255.16
  6. Step 6: Final answer
    x = 959.49

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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.