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Finding the Fourth Proportional to 1,128.97, 1,693.73 and 398.71

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Solution

The fourth proportional to 1,128.97, 1,693.73 and 398.71 is: 598.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.97 : 1,693.73 = 398.71 : x
  2. Step 2: Convert to fraction form
    1,128.97/1,693.73 = 398.71/x
  3. Step 3: Cross multiply
    1,128.97x = 1,693.73 × 398.71
  4. Step 4: Simplify right side
    1,128.97x = 675,305.09
  5. Step 5: Solve for x
    x = 675,305.09/1,128.97
  6. Step 6: Final answer
    x = 598.16

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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.