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Finding the Fourth Proportional to 399.15, 551.59 and 300.74

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Solution

The fourth proportional to 399.15, 551.59 and 300.74 is: 415.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.15 : 551.59 = 300.74 : x
  2. Step 2: Convert to fraction form
    399.15/551.59 = 300.74/x
  3. Step 3: Cross multiply
    399.15x = 551.59 × 300.74
  4. Step 4: Simplify right side
    399.15x = 165,881.67
  5. Step 5: Solve for x
    x = 165,881.67/399.15
  6. Step 6: Final answer
    x = 415.59

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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.