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Finding the Fourth Proportional to 430.78, 646.17 and 134.29

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Solution

The fourth proportional to 430.78, 646.17 and 134.29 is: 201.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    430.78 : 646.17 = 134.29 : x
  2. Step 2: Convert to fraction form
    430.78/646.17 = 134.29/x
  3. Step 3: Cross multiply
    430.78x = 646.17 × 134.29
  4. Step 4: Simplify right side
    430.78x = 86,775.45
  5. Step 5: Solve for x
    x = 86,775.45/430.78
  6. Step 6: Final answer
    x = 201.44

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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.