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Finding the Fourth Proportional to 309.40, 464.20 and 155.48

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Solution

The fourth proportional to 309.40, 464.20 and 155.48 is: 233.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.40 : 464.20 = 155.48 : x
  2. Step 2: Convert to fraction form
    309.40/464.20 = 155.48/x
  3. Step 3: Cross multiply
    309.40x = 464.20 × 155.48
  4. Step 4: Simplify right side
    309.40x = 72,173.82
  5. Step 5: Solve for x
    x = 72,173.82/309.40
  6. Step 6: Final answer
    x = 233.27

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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.