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Finding the Fourth Proportional to 448.09, 618.64 and 308.45

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Solution

The fourth proportional to 448.09, 618.64 and 308.45 is: 425.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.09 : 618.64 = 308.45 : x
  2. Step 2: Convert to fraction form
    448.09/618.64 = 308.45/x
  3. Step 3: Cross multiply
    448.09x = 618.64 × 308.45
  4. Step 4: Simplify right side
    448.09x = 190,820.28
  5. Step 5: Solve for x
    x = 190,820.28/448.09
  6. Step 6: Final answer
    x = 425.85

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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.