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Finding the Fourth Proportional to 289.86, 434.12 and 143.34

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Solution

The fourth proportional to 289.86, 434.12 and 143.34 is: 214.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.86 : 434.12 = 143.34 : x
  2. Step 2: Convert to fraction form
    289.86/434.12 = 143.34/x
  3. Step 3: Cross multiply
    289.86x = 434.12 × 143.34
  4. Step 4: Simplify right side
    289.86x = 62,226.04
  5. Step 5: Solve for x
    x = 62,226.04/289.86
  6. Step 6: Final answer
    x = 214.68

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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.