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Finding the Fourth Proportional to 448.16, 617.82 and 398.96

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Solution

The fourth proportional to 448.16, 617.82 and 398.96 is: 549.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.16 : 617.82 = 398.96 : x
  2. Step 2: Convert to fraction form
    448.16/617.82 = 398.96/x
  3. Step 3: Cross multiply
    448.16x = 617.82 × 398.96
  4. Step 4: Simplify right side
    448.16x = 246,485.47
  5. Step 5: Solve for x
    x = 246,485.47/448.16
  6. Step 6: Final answer
    x = 549.99

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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.