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Finding the Fourth Proportional to 289.42, 434.26 and 127.15

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Solution

The fourth proportional to 289.42, 434.26 and 127.15 is: 190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.42 : 434.26 = 127.15 : x
  2. Step 2: Convert to fraction form
    289.42/434.26 = 127.15/x
  3. Step 3: Cross multiply
    289.42x = 434.26 × 127.15
  4. Step 4: Simplify right side
    289.42x = 55,216.16
  5. Step 5: Solve for x
    x = 55,216.16/289.42
  6. Step 6: Final answer
    x = 190.78

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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.