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Finding the Fourth Proportional to 289.61, 434.09 and 143.05

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Solution

The fourth proportional to 289.61, 434.09 and 143.05 is: 214.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.61 : 434.09 = 143.05 : x
  2. Step 2: Convert to fraction form
    289.61/434.09 = 143.05/x
  3. Step 3: Cross multiply
    289.61x = 434.09 × 143.05
  4. Step 4: Simplify right side
    289.61x = 62,094.77
  5. Step 5: Solve for x
    x = 62,094.77/289.61
  6. Step 6: Final answer
    x = 214.41

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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.