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Finding the Fourth Proportional to 419.74, 579.21 and 245.06

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Solution

The fourth proportional to 419.74, 579.21 and 245.06 is: 338.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.74 : 579.21 = 245.06 : x
  2. Step 2: Convert to fraction form
    419.74/579.21 = 245.06/x
  3. Step 3: Cross multiply
    419.74x = 579.21 × 245.06
  4. Step 4: Simplify right side
    419.74x = 141,941.20
  5. Step 5: Solve for x
    x = 141,941.20/419.74
  6. Step 6: Final answer
    x = 338.16

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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.