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Finding the Fourth Proportional to 420.05, 630.30 and 359.45

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Solution

The fourth proportional to 420.05, 630.30 and 359.45 is: 539.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.05 : 630.30 = 359.45 : x
  2. Step 2: Convert to fraction form
    420.05/630.30 = 359.45/x
  3. Step 3: Cross multiply
    420.05x = 630.30 × 359.45
  4. Step 4: Simplify right side
    420.05x = 226,561.34
  5. Step 5: Solve for x
    x = 226,561.34/420.05
  6. Step 6: Final answer
    x = 539.37

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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.