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Finding the Fourth Proportional to 730.18, 1,007.61 and 398.59

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Solution

The fourth proportional to 730.18, 1,007.61 and 398.59 is: 550.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.18 : 1,007.61 = 398.59 : x
  2. Step 2: Convert to fraction form
    730.18/1,007.61 = 398.59/x
  3. Step 3: Cross multiply
    730.18x = 1,007.61 × 398.59
  4. Step 4: Simplify right side
    730.18x = 401,618.23
  5. Step 5: Solve for x
    x = 401,618.23/730.18
  6. Step 6: Final answer
    x = 550.03

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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.