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Finding the Fourth Proportional to 328.59, 492.90 and 85.11

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Solution

The fourth proportional to 328.59, 492.90 and 85.11 is: 127.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.59 : 492.90 = 85.11 : x
  2. Step 2: Convert to fraction form
    328.59/492.90 = 85.11/x
  3. Step 3: Cross multiply
    328.59x = 492.90 × 85.11
  4. Step 4: Simplify right side
    328.59x = 41,952.14
  5. Step 5: Solve for x
    x = 41,952.14/328.59
  6. Step 6: Final answer
    x = 127.67

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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.