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Finding the Fourth Proportional to 421.74, 628.35 and 401.07

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Solution

The fourth proportional to 421.74, 628.35 and 401.07 is: 597.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.74 : 628.35 = 401.07 : x
  2. Step 2: Convert to fraction form
    421.74/628.35 = 401.07/x
  3. Step 3: Cross multiply
    421.74x = 628.35 × 401.07
  4. Step 4: Simplify right side
    421.74x = 252,012.33
  5. Step 5: Solve for x
    x = 252,012.33/421.74
  6. Step 6: Final answer
    x = 597.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.