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Finding the Fourth Proportional to 156.78, 235.26 and 84.66

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Solution

The fourth proportional to 156.78, 235.26 and 84.66 is: 127.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.78 : 235.26 = 84.66 : x
  2. Step 2: Convert to fraction form
    156.78/235.26 = 84.66/x
  3. Step 3: Cross multiply
    156.78x = 235.26 × 84.66
  4. Step 4: Simplify right side
    156.78x = 19,917.11
  5. Step 5: Solve for x
    x = 19,917.11/156.78
  6. Step 6: Final answer
    x = 127.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.