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Finding the Fourth Proportional to 253.21, 378.93 and 155.67

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Solution

The fourth proportional to 253.21, 378.93 and 155.67 is: 232.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.21 : 378.93 = 155.67 : x
  2. Step 2: Convert to fraction form
    253.21/378.93 = 155.67/x
  3. Step 3: Cross multiply
    253.21x = 378.93 × 155.67
  4. Step 4: Simplify right side
    253.21x = 58,988.03
  5. Step 5: Solve for x
    x = 58,988.03/253.21
  6. Step 6: Final answer
    x = 232.96

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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.