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Finding the Fourth Proportional to 644.83, 890.17 and 423.86

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Solution

The fourth proportional to 644.83, 890.17 and 423.86 is: 585.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.83 : 890.17 = 423.86 : x
  2. Step 2: Convert to fraction form
    644.83/890.17 = 423.86/x
  3. Step 3: Cross multiply
    644.83x = 890.17 × 423.86
  4. Step 4: Simplify right side
    644.83x = 377,301.95
  5. Step 5: Solve for x
    x = 377,301.95/644.83
  6. Step 6: Final answer
    x = 585.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.