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Finding the Fourth Proportional to 1,238.21, 1,708.50 and 706.85

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Solution

The fourth proportional to 1,238.21, 1,708.50 and 706.85 is: 975.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.21 : 1,708.50 = 706.85 : x
  2. Step 2: Convert to fraction form
    1,238.21/1,708.50 = 706.85/x
  3. Step 3: Cross multiply
    1,238.21x = 1,708.50 × 706.85
  4. Step 4: Simplify right side
    1,238.21x = 1,207,644.68
  5. Step 5: Solve for x
    x = 1,207,644.68/1,238.21
  6. Step 6: Final answer
    x = 975.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.