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Finding the Fourth Proportional to 401.96, 555.06 and 309.62

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Solution

The fourth proportional to 401.96, 555.06 and 309.62 is: 427.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.96 : 555.06 = 309.62 : x
  2. Step 2: Convert to fraction form
    401.96/555.06 = 309.62/x
  3. Step 3: Cross multiply
    401.96x = 555.06 × 309.62
  4. Step 4: Simplify right side
    401.96x = 171,857.68
  5. Step 5: Solve for x
    x = 171,857.68/401.96
  6. Step 6: Final answer
    x = 427.55

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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.