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Finding the Fourth Proportional to 420.25, 579.71 and 252.16

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Solution

The fourth proportional to 420.25, 579.71 and 252.16 is: 347.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.25 : 579.71 = 252.16 : x
  2. Step 2: Convert to fraction form
    420.25/579.71 = 252.16/x
  3. Step 3: Cross multiply
    420.25x = 579.71 × 252.16
  4. Step 4: Simplify right side
    420.25x = 146,181.95
  5. Step 5: Solve for x
    x = 146,181.95/420.25
  6. Step 6: Final answer
    x = 347.84

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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.