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Finding the Fourth Proportional to 328.99, 493.48 and 123.55

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Solution

The fourth proportional to 328.99, 493.48 and 123.55 is: 185.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.99 : 493.48 = 123.55 : x
  2. Step 2: Convert to fraction form
    328.99/493.48 = 123.55/x
  3. Step 3: Cross multiply
    328.99x = 493.48 × 123.55
  4. Step 4: Simplify right side
    328.99x = 60,966.37
  5. Step 5: Solve for x
    x = 60,966.37/328.99
  6. Step 6: Final answer
    x = 185.32

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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.