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Finding the Fourth Proportional to 328.54, 492.80 and 85.06

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Solution

The fourth proportional to 328.54, 492.80 and 85.06 is: 127.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.54 : 492.80 = 85.06 : x
  2. Step 2: Convert to fraction form
    328.54/492.80 = 85.06/x
  3. Step 3: Cross multiply
    328.54x = 492.80 × 85.06
  4. Step 4: Simplify right side
    328.54x = 41,916.34
  5. Step 5: Solve for x
    x = 41,916.34/328.54
  6. Step 6: Final answer
    x = 127.58

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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.