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Finding the Fourth Proportional to 313.72, 432.90 and 189.37

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Solution

The fourth proportional to 313.72, 432.90 and 189.37 is: 261.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.72 : 432.90 = 189.37 : x
  2. Step 2: Convert to fraction form
    313.72/432.90 = 189.37/x
  3. Step 3: Cross multiply
    313.72x = 432.90 × 189.37
  4. Step 4: Simplify right side
    313.72x = 81,978.27
  5. Step 5: Solve for x
    x = 81,978.27/313.72
  6. Step 6: Final answer
    x = 261.31

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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.