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Finding the Fourth Proportional to 289.23, 433.55 and 142.79

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Solution

The fourth proportional to 289.23, 433.55 and 142.79 is: 214.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.23 : 433.55 = 142.79 : x
  2. Step 2: Convert to fraction form
    289.23/433.55 = 142.79/x
  3. Step 3: Cross multiply
    289.23x = 433.55 × 142.79
  4. Step 4: Simplify right side
    289.23x = 61,903.72
  5. Step 5: Solve for x
    x = 61,903.72/289.23
  6. Step 6: Final answer
    x = 214.03

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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.