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Finding the Fourth Proportional to 1,238.19, 1,708 and 740.73

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Solution

The fourth proportional to 1,238.19, 1,708 and 740.73 is: 1,021.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.19 : 1,708 = 740.73 : x
  2. Step 2: Convert to fraction form
    1,238.19/1,708 = 740.73/x
  3. Step 3: Cross multiply
    1,238.19x = 1,708 × 740.73
  4. Step 4: Simplify right side
    1,238.19x = 1,265,166.84
  5. Step 5: Solve for x
    x = 1,265,166.84/1,238.19
  6. Step 6: Final answer
    x = 1,021.79

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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.