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Finding the Fourth Proportional to 328.12, 452.40 and 291.20

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Solution

The fourth proportional to 328.12, 452.40 and 291.20 is: 401.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.12 : 452.40 = 291.20 : x
  2. Step 2: Convert to fraction form
    328.12/452.40 = 291.20/x
  3. Step 3: Cross multiply
    328.12x = 452.40 × 291.20
  4. Step 4: Simplify right side
    328.12x = 131,738.88
  5. Step 5: Solve for x
    x = 131,738.88/328.12
  6. Step 6: Final answer
    x = 401.50

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.