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Finding the Fourth Proportional to 1,238.18, 1,708.95 and 740.63

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Solution

The fourth proportional to 1,238.18, 1,708.95 and 740.63 is: 1,022.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,238.18 : 1,708.95 = 740.63 : x
  2. Step 2: Convert to fraction form
    1,238.18/1,708.95 = 740.63/x
  3. Step 3: Cross multiply
    1,238.18x = 1,708.95 × 740.63
  4. Step 4: Simplify right side
    1,238.18x = 1,265,691.09
  5. Step 5: Solve for x
    x = 1,265,691.09/1,238.18
  6. Step 6: Final answer
    x = 1,022.22

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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.