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Finding the Fourth Proportional to 156.51, 217.71 and 153.54

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Solution

The fourth proportional to 156.51, 217.71 and 153.54 is: 213.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.51 : 217.71 = 153.54 : x
  2. Step 2: Convert to fraction form
    156.51/217.71 = 153.54/x
  3. Step 3: Cross multiply
    156.51x = 217.71 × 153.54
  4. Step 4: Simplify right side
    156.51x = 33,427.19
  5. Step 5: Solve for x
    x = 33,427.19/156.51
  6. Step 6: Final answer
    x = 213.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.