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Finding the Fourth Proportional to 421.69, 632.69 and 300.90

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Solution

The fourth proportional to 421.69, 632.69 and 300.90 is: 451.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.69 : 632.69 = 300.90 : x
  2. Step 2: Convert to fraction form
    421.69/632.69 = 300.90/x
  3. Step 3: Cross multiply
    421.69x = 632.69 × 300.90
  4. Step 4: Simplify right side
    421.69x = 190,376.42
  5. Step 5: Solve for x
    x = 190,376.42/421.69
  6. Step 6: Final answer
    x = 451.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.