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Finding the Fourth Proportional to 448.98, 620.58 and 396.15

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Solution

The fourth proportional to 448.98, 620.58 and 396.15 is: 547.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.98 : 620.58 = 396.15 : x
  2. Step 2: Convert to fraction form
    448.98/620.58 = 396.15/x
  3. Step 3: Cross multiply
    448.98x = 620.58 × 396.15
  4. Step 4: Simplify right side
    448.98x = 245,842.77
  5. Step 5: Solve for x
    x = 245,842.77/448.98
  6. Step 6: Final answer
    x = 547.56

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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.