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Finding the Fourth Proportional to 156.32, 215.61 and 119.57

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Solution

The fourth proportional to 156.32, 215.61 and 119.57 is: 164.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.32 : 215.61 = 119.57 : x
  2. Step 2: Convert to fraction form
    156.32/215.61 = 119.57/x
  3. Step 3: Cross multiply
    156.32x = 215.61 × 119.57
  4. Step 4: Simplify right side
    156.32x = 25,780.49
  5. Step 5: Solve for x
    x = 25,780.49/156.32
  6. Step 6: Final answer
    x = 164.92

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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.