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Finding the Fourth Proportional to 417.40, 626.16 and 128.82

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Solution

The fourth proportional to 417.40, 626.16 and 128.82 is: 193.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.40 : 626.16 = 128.82 : x
  2. Step 2: Convert to fraction form
    417.40/626.16 = 128.82/x
  3. Step 3: Cross multiply
    417.40x = 626.16 × 128.82
  4. Step 4: Simplify right side
    417.40x = 80,661.93
  5. Step 5: Solve for x
    x = 80,661.93/417.40
  6. Step 6: Final answer
    x = 193.25

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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.