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Finding the Fourth Proportional to 448.48, 618.64 and 398.60

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Solution

The fourth proportional to 448.48, 618.64 and 398.60 is: 549.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.48 : 618.64 = 398.60 : x
  2. Step 2: Convert to fraction form
    448.48/618.64 = 398.60/x
  3. Step 3: Cross multiply
    448.48x = 618.64 × 398.60
  4. Step 4: Simplify right side
    448.48x = 246,588.13
  5. Step 5: Solve for x
    x = 246,588.13/448.48
  6. Step 6: Final answer
    x = 549.83

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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.