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Finding the Fourth Proportional to 156.91, 235.23 and 111.55

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Solution

The fourth proportional to 156.91, 235.23 and 111.55 is: 167.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.91 : 235.23 = 111.55 : x
  2. Step 2: Convert to fraction form
    156.91/235.23 = 111.55/x
  3. Step 3: Cross multiply
    156.91x = 235.23 × 111.55
  4. Step 4: Simplify right side
    156.91x = 26,239.91
  5. Step 5: Solve for x
    x = 26,239.91/156.91
  6. Step 6: Final answer
    x = 167.23

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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.