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Finding the Fourth Proportional to 421.36, 632.08 and 215.90

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Solution

The fourth proportional to 421.36, 632.08 and 215.90 is: 323.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.36 : 632.08 = 215.90 : x
  2. Step 2: Convert to fraction form
    421.36/632.08 = 215.90/x
  3. Step 3: Cross multiply
    421.36x = 632.08 × 215.90
  4. Step 4: Simplify right side
    421.36x = 136,466.07
  5. Step 5: Solve for x
    x = 136,466.07/421.36
  6. Step 6: Final answer
    x = 323.87

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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.