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Finding the Fourth Proportional to 328.66, 451.12 and 290.99

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Solution

The fourth proportional to 328.66, 451.12 and 290.99 is: 399.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.66 : 451.12 = 290.99 : x
  2. Step 2: Convert to fraction form
    328.66/451.12 = 290.99/x
  3. Step 3: Cross multiply
    328.66x = 451.12 × 290.99
  4. Step 4: Simplify right side
    328.66x = 131,271.41
  5. Step 5: Solve for x
    x = 131,271.41/328.66
  6. Step 6: Final answer
    x = 399.41

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.