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Finding the Fourth Proportional to 420.92, 630.76 and 369.44

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Solution

The fourth proportional to 420.92, 630.76 and 369.44 is: 553.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.92 : 630.76 = 369.44 : x
  2. Step 2: Convert to fraction form
    420.92/630.76 = 369.44/x
  3. Step 3: Cross multiply
    420.92x = 630.76 × 369.44
  4. Step 4: Simplify right side
    420.92x = 233,027.97
  5. Step 5: Solve for x
    x = 233,027.97/420.92
  6. Step 6: Final answer
    x = 553.62

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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.