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Finding the Fourth Proportional to 536.40, 804.78 and 211.80

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Solution

The fourth proportional to 536.40, 804.78 and 211.80 is: 317.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    536.40 : 804.78 = 211.80 : x
  2. Step 2: Convert to fraction form
    536.40/804.78 = 211.80/x
  3. Step 3: Cross multiply
    536.40x = 804.78 × 211.80
  4. Step 4: Simplify right side
    536.40x = 170,452.40
  5. Step 5: Solve for x
    x = 170,452.40/536.40
  6. Step 6: Final answer
    x = 317.77

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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.