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Finding the Fourth Proportional to 328.02, 491.71 and 145.46

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Solution

The fourth proportional to 328.02, 491.71 and 145.46 is: 218.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.02 : 491.71 = 145.46 : x
  2. Step 2: Convert to fraction form
    328.02/491.71 = 145.46/x
  3. Step 3: Cross multiply
    328.02x = 491.71 × 145.46
  4. Step 4: Simplify right side
    328.02x = 71,524.14
  5. Step 5: Solve for x
    x = 71,524.14/328.02
  6. Step 6: Final answer
    x = 218.05

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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.