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Finding the Fourth Proportional to 328.51, 492.72 and 85.03

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Solution

The fourth proportional to 328.51, 492.72 and 85.03 is: 127.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.51 : 492.72 = 85.03 : x
  2. Step 2: Convert to fraction form
    328.51/492.72 = 85.03/x
  3. Step 3: Cross multiply
    328.51x = 492.72 × 85.03
  4. Step 4: Simplify right side
    328.51x = 41,895.98
  5. Step 5: Solve for x
    x = 41,895.98/328.51
  6. Step 6: Final answer
    x = 127.53

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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.