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Finding the Fourth Proportional to 289.12, 433.88 and 126.72

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Solution

The fourth proportional to 289.12, 433.88 and 126.72 is: 190.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.12 : 433.88 = 126.72 : x
  2. Step 2: Convert to fraction form
    289.12/433.88 = 126.72/x
  3. Step 3: Cross multiply
    289.12x = 433.88 × 126.72
  4. Step 4: Simplify right side
    289.12x = 54,981.27
  5. Step 5: Solve for x
    x = 54,981.27/289.12
  6. Step 6: Final answer
    x = 190.17

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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.