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Finding the Fourth Proportional to 398.64, 598.28 and 155.36

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Solution

The fourth proportional to 398.64, 598.28 and 155.36 is: 233.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.64 : 598.28 = 155.36 : x
  2. Step 2: Convert to fraction form
    398.64/598.28 = 155.36/x
  3. Step 3: Cross multiply
    398.64x = 598.28 × 155.36
  4. Step 4: Simplify right side
    398.64x = 92,948.78
  5. Step 5: Solve for x
    x = 92,948.78/398.64
  6. Step 6: Final answer
    x = 233.16

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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.