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Finding the Fourth Proportional to 730.32, 1,007.82 and 398.76

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Solution

The fourth proportional to 730.32, 1,007.82 and 398.76 is: 550.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    730.32 : 1,007.82 = 398.76 : x
  2. Step 2: Convert to fraction form
    730.32/1,007.82 = 398.76/x
  3. Step 3: Cross multiply
    730.32x = 1,007.82 × 398.76
  4. Step 4: Simplify right side
    730.32x = 401,878.30
  5. Step 5: Solve for x
    x = 401,878.30/730.32
  6. Step 6: Final answer
    x = 550.28

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Double scale
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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.