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Finding the Fourth Proportional to 419.16, 628.77 and 126.65

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Solution

The fourth proportional to 419.16, 628.77 and 126.65 is: 189.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.16 : 628.77 = 126.65 : x
  2. Step 2: Convert to fraction form
    419.16/628.77 = 126.65/x
  3. Step 3: Cross multiply
    419.16x = 628.77 × 126.65
  4. Step 4: Simplify right side
    419.16x = 79,630.58
  5. Step 5: Solve for x
    x = 79,630.58/419.16
  6. Step 6: Final answer
    x = 189.98

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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.