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Finding the Fourth Proportional to 448.35, 618.99 and 308.71

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Solution

The fourth proportional to 448.35, 618.99 and 308.71 is: 426.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    448.35 : 618.99 = 308.71 : x
  2. Step 2: Convert to fraction form
    448.35/618.99 = 308.71/x
  3. Step 3: Cross multiply
    448.35x = 618.99 × 308.71
  4. Step 4: Simplify right side
    448.35x = 191,088.40
  5. Step 5: Solve for x
    x = 191,088.40/448.35
  6. Step 6: Final answer
    x = 426.20

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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.