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Finding the Fourth Proportional to 417.01, 625.58 and 128.38

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Solution

The fourth proportional to 417.01, 625.58 and 128.38 is: 192.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.01 : 625.58 = 128.38 : x
  2. Step 2: Convert to fraction form
    417.01/625.58 = 128.38/x
  3. Step 3: Cross multiply
    417.01x = 625.58 × 128.38
  4. Step 4: Simplify right side
    417.01x = 80,311.96
  5. Step 5: Solve for x
    x = 80,311.96/417.01
  6. Step 6: Final answer
    x = 192.59

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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.