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Finding the Fourth Proportional to 458.86, 688.21 and 211.99

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Solution

The fourth proportional to 458.86, 688.21 and 211.99 is: 317.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.86 : 688.21 = 211.99 : x
  2. Step 2: Convert to fraction form
    458.86/688.21 = 211.99/x
  3. Step 3: Cross multiply
    458.86x = 688.21 × 211.99
  4. Step 4: Simplify right side
    458.86x = 145,891.39
  5. Step 5: Solve for x
    x = 145,891.39/458.86
  6. Step 6: Final answer
    x = 317.94

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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.