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Finding the Fourth Proportional to 417.49, 626.23 and 128.93

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Solution

The fourth proportional to 417.49, 626.23 and 128.93 is: 193.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.49 : 626.23 = 128.93 : x
  2. Step 2: Convert to fraction form
    417.49/626.23 = 128.93/x
  3. Step 3: Cross multiply
    417.49x = 626.23 × 128.93
  4. Step 4: Simplify right side
    417.49x = 80,739.83
  5. Step 5: Solve for x
    x = 80,739.83/417.49
  6. Step 6: Final answer
    x = 193.39

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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.