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Finding the Fourth Proportional to 421.86, 632.36 and 215.99

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Solution

The fourth proportional to 421.86, 632.36 and 215.99 is: 323.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    421.86 : 632.36 = 215.99 : x
  2. Step 2: Convert to fraction form
    421.86/632.36 = 215.99/x
  3. Step 3: Cross multiply
    421.86x = 632.36 × 215.99
  4. Step 4: Simplify right side
    421.86x = 136,580.81
  5. Step 5: Solve for x
    x = 136,580.81/421.86
  6. Step 6: Final answer
    x = 323.76

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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.