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Finding the Fourth Proportional to 499.90, 749.42 and 211.54

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Solution

The fourth proportional to 499.90, 749.42 and 211.54 is: 317.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.90 : 749.42 = 211.54 : x
  2. Step 2: Convert to fraction form
    499.90/749.42 = 211.54/x
  3. Step 3: Cross multiply
    499.90x = 749.42 × 211.54
  4. Step 4: Simplify right side
    499.90x = 158,532.31
  5. Step 5: Solve for x
    x = 158,532.31/499.90
  6. Step 6: Final answer
    x = 317.13

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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.