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Finding the Fourth Proportional to 157.41, 235.91 and 103.21

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Solution

The fourth proportional to 157.41, 235.91 and 103.21 is: 154.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.41 : 235.91 = 103.21 : x
  2. Step 2: Convert to fraction form
    157.41/235.91 = 103.21/x
  3. Step 3: Cross multiply
    157.41x = 235.91 × 103.21
  4. Step 4: Simplify right side
    157.41x = 24,347.94
  5. Step 5: Solve for x
    x = 24,347.94/157.41
  6. Step 6: Final answer
    x = 154.68

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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.