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Finding the Fourth Proportional to 328.55, 492.91 and 123.17

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Solution

The fourth proportional to 328.55, 492.91 and 123.17 is: 184.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.55 : 492.91 = 123.17 : x
  2. Step 2: Convert to fraction form
    328.55/492.91 = 123.17/x
  3. Step 3: Cross multiply
    328.55x = 492.91 × 123.17
  4. Step 4: Simplify right side
    328.55x = 60,708.95
  5. Step 5: Solve for x
    x = 60,708.95/328.55
  6. Step 6: Final answer
    x = 184.78

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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.