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Finding the Fourth Proportional to 328.04, 491.94 and 142.88

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Solution

The fourth proportional to 328.04, 491.94 and 142.88 is: 214.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.04 : 491.94 = 142.88 : x
  2. Step 2: Convert to fraction form
    328.04/491.94 = 142.88/x
  3. Step 3: Cross multiply
    328.04x = 491.94 × 142.88
  4. Step 4: Simplify right side
    328.04x = 70,285.93
  5. Step 5: Solve for x
    x = 70,285.93/328.04
  6. Step 6: Final answer
    x = 214.26

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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.