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Finding the Fourth Proportional to 156.88, 215.09 and 154.49

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Solution

The fourth proportional to 156.88, 215.09 and 154.49 is: 211.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.88 : 215.09 = 154.49 : x
  2. Step 2: Convert to fraction form
    156.88/215.09 = 154.49/x
  3. Step 3: Cross multiply
    156.88x = 215.09 × 154.49
  4. Step 4: Simplify right side
    156.88x = 33,228.48
  5. Step 5: Solve for x
    x = 33,228.48/156.88
  6. Step 6: Final answer
    x = 211.81

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.