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Finding the Fourth Proportional to 398.68, 598.08 and 225.40

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Solution

The fourth proportional to 398.68, 598.08 and 225.40 is: 338.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.68 : 598.08 = 225.40 : x
  2. Step 2: Convert to fraction form
    398.68/598.08 = 225.40/x
  3. Step 3: Cross multiply
    398.68x = 598.08 × 225.40
  4. Step 4: Simplify right side
    398.68x = 134,807.23
  5. Step 5: Solve for x
    x = 134,807.23/398.68
  6. Step 6: Final answer
    x = 338.13

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.