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Finding the Fourth Proportional to 551.30, 827.34 and 421.67

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Solution

The fourth proportional to 551.30, 827.34 and 421.67 is: 632.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    551.30 : 827.34 = 421.67 : x
  2. Step 2: Convert to fraction form
    551.30/827.34 = 421.67/x
  3. Step 3: Cross multiply
    551.30x = 827.34 × 421.67
  4. Step 4: Simplify right side
    551.30x = 348,865.00
  5. Step 5: Solve for x
    x = 348,865.00/551.30
  6. Step 6: Final answer
    x = 632.81

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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.