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Finding the Fourth Proportional to 420.02, 579.67 and 245.38

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Solution

The fourth proportional to 420.02, 579.67 and 245.38 is: 338.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.02 : 579.67 = 245.38 : x
  2. Step 2: Convert to fraction form
    420.02/579.67 = 245.38/x
  3. Step 3: Cross multiply
    420.02x = 579.67 × 245.38
  4. Step 4: Simplify right side
    420.02x = 142,239.42
  5. Step 5: Solve for x
    x = 142,239.42/420.02
  6. Step 6: Final answer
    x = 338.65

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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.