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Finding the Fourth Proportional to 156.80, 234.06 and 145.54

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Solution

The fourth proportional to 156.80, 234.06 and 145.54 is: 217.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    156.80 : 234.06 = 145.54 : x
  2. Step 2: Convert to fraction form
    156.80/234.06 = 145.54/x
  3. Step 3: Cross multiply
    156.80x = 234.06 × 145.54
  4. Step 4: Simplify right side
    156.80x = 34,065.09
  5. Step 5: Solve for x
    x = 34,065.09/156.80
  6. Step 6: Final answer
    x = 217.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.