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Finding the Fourth Proportional to 398.57, 550.53 and 304.74

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Solution

The fourth proportional to 398.57, 550.53 and 304.74 is: 420.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.57 : 550.53 = 304.74 : x
  2. Step 2: Convert to fraction form
    398.57/550.53 = 304.74/x
  3. Step 3: Cross multiply
    398.57x = 550.53 × 304.74
  4. Step 4: Simplify right side
    398.57x = 167,768.51
  5. Step 5: Solve for x
    x = 167,768.51/398.57
  6. Step 6: Final answer
    x = 420.93

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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.