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Finding the Fourth Proportional to 1,370.56, 2,054.42 and 639.54

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Solution

The fourth proportional to 1,370.56, 2,054.42 and 639.54 is: 958.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,370.56 : 2,054.42 = 639.54 : x
  2. Step 2: Convert to fraction form
    1,370.56/2,054.42 = 639.54/x
  3. Step 3: Cross multiply
    1,370.56x = 2,054.42 × 639.54
  4. Step 4: Simplify right side
    1,370.56x = 1,313,883.77
  5. Step 5: Solve for x
    x = 1,313,883.77/1,370.56
  6. Step 6: Final answer
    x = 958.65

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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.