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Finding the Fourth Proportional to 189.54, 261.54 and 156.78

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Solution

The fourth proportional to 189.54, 261.54 and 156.78 is: 216.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.54 : 261.54 = 156.78 : x
  2. Step 2: Convert to fraction form
    189.54/261.54 = 156.78/x
  3. Step 3: Cross multiply
    189.54x = 261.54 × 156.78
  4. Step 4: Simplify right side
    189.54x = 41,004.24
  5. Step 5: Solve for x
    x = 41,004.24/189.54
  6. Step 6: Final answer
    x = 216.34

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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.