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Finding the Fourth Proportional to 730.25, 1,007.71 and 398.66

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Solution

The fourth proportional to 730.25, 1,007.71 and 398.66 is: 550.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.25 : 1,007.71 = 398.66 : x
  2. Step 2: Convert to fraction form
    730.25/1,007.71 = 398.66/x
  3. Step 3: Cross multiply
    730.25x = 1,007.71 × 398.66
  4. Step 4: Simplify right side
    730.25x = 401,733.67
  5. Step 5: Solve for x
    x = 401,733.67/730.25
  6. Step 6: Final answer
    x = 550.13

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1.5x scale

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.