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Finding the Fourth Proportional to 313.90, 433.20 and 189.56

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Solution

The fourth proportional to 313.90, 433.20 and 189.56 is: 261.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.90 : 433.20 = 189.56 : x
  2. Step 2: Convert to fraction form
    313.90/433.20 = 189.56/x
  3. Step 3: Cross multiply
    313.90x = 433.20 × 189.56
  4. Step 4: Simplify right side
    313.90x = 82,117.39
  5. Step 5: Solve for x
    x = 82,117.39/313.90
  6. Step 6: Final answer
    x = 261.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.