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Finding the Fourth Proportional to 328.10, 491.70 and 181.51

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Solution

The fourth proportional to 328.10, 491.70 and 181.51 is: 272.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.10 : 491.70 = 181.51 : x
  2. Step 2: Convert to fraction form
    328.10/491.70 = 181.51/x
  3. Step 3: Cross multiply
    328.10x = 491.70 × 181.51
  4. Step 4: Simplify right side
    328.10x = 89,247.92
  5. Step 5: Solve for x
    x = 89,247.92/328.10
  6. Step 6: Final answer
    x = 272.02

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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.