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Finding the Fourth Proportional to 306.40, 458.49 and 214.90

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Solution

The fourth proportional to 306.40, 458.49 and 214.90 is: 321.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.40 : 458.49 = 214.90 : x
  2. Step 2: Convert to fraction form
    306.40/458.49 = 214.90/x
  3. Step 3: Cross multiply
    306.40x = 458.49 × 214.90
  4. Step 4: Simplify right side
    306.40x = 98,529.50
  5. Step 5: Solve for x
    x = 98,529.50/306.40
  6. Step 6: Final answer
    x = 321.57

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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.