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Finding the Fourth Proportional to 289.41, 434.21 and 210.65

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Solution

The fourth proportional to 289.41, 434.21 and 210.65 is: 316.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.41 : 434.21 = 210.65 : x
  2. Step 2: Convert to fraction form
    289.41/434.21 = 210.65/x
  3. Step 3: Cross multiply
    289.41x = 434.21 × 210.65
  4. Step 4: Simplify right side
    289.41x = 91,463.11
  5. Step 5: Solve for x
    x = 91,463.11/289.41
  6. Step 6: Final answer
    x = 316.03

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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.