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Finding the Fourth Proportional to 189.78, 261.62 and 156.44

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Solution

The fourth proportional to 189.78, 261.62 and 156.44 is: 215.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.78 : 261.62 = 156.44 : x
  2. Step 2: Convert to fraction form
    189.78/261.62 = 156.44/x
  3. Step 3: Cross multiply
    189.78x = 261.62 × 156.44
  4. Step 4: Simplify right side
    189.78x = 40,927.83
  5. Step 5: Solve for x
    x = 40,927.83/189.78
  6. Step 6: Final answer
    x = 215.66

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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.