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Finding the Fourth Proportional to 358.78, 538.18 and 102.28

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Solution

The fourth proportional to 358.78, 538.18 and 102.28 is: 153.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    358.78 : 538.18 = 102.28 : x
  2. Step 2: Convert to fraction form
    358.78/538.18 = 102.28/x
  3. Step 3: Cross multiply
    358.78x = 538.18 × 102.28
  4. Step 4: Simplify right side
    358.78x = 55,045.05
  5. Step 5: Solve for x
    x = 55,045.05/358.78
  6. Step 6: Final answer
    x = 153.42

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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.