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Finding the Fourth Proportional to 189.02, 261.04 and 123.56

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Solution

The fourth proportional to 189.02, 261.04 and 123.56 is: 170.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    189.02 : 261.04 = 123.56 : x
  2. Step 2: Convert to fraction form
    189.02/261.04 = 123.56/x
  3. Step 3: Cross multiply
    189.02x = 261.04 × 123.56
  4. Step 4: Simplify right side
    189.02x = 32,254.45
  5. Step 5: Solve for x
    x = 32,254.45/189.02
  6. Step 6: Final answer
    x = 170.64

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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.