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Finding the Fourth Proportional to 639.29, 882.24 and 491.67

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Solution

The fourth proportional to 639.29, 882.24 and 491.67 is: 678.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.29 : 882.24 = 491.67 : x
  2. Step 2: Convert to fraction form
    639.29/882.24 = 491.67/x
  3. Step 3: Cross multiply
    639.29x = 882.24 × 491.67
  4. Step 4: Simplify right side
    639.29x = 433,771.86
  5. Step 5: Solve for x
    x = 433,771.86/639.29
  6. Step 6: Final answer
    x = 678.52

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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.