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Finding the Fourth Proportional to 261.09, 389.36 and 222.81

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Solution

The fourth proportional to 261.09, 389.36 and 222.81 is: 332.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.09 : 389.36 = 222.81 : x
  2. Step 2: Convert to fraction form
    261.09/389.36 = 222.81/x
  3. Step 3: Cross multiply
    261.09x = 389.36 × 222.81
  4. Step 4: Simplify right side
    261.09x = 86,752.19
  5. Step 5: Solve for x
    x = 86,752.19/261.09
  6. Step 6: Final answer
    x = 332.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.