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Finding the Fourth Proportional to 397.20, 595.90 and 328.05

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Solution

The fourth proportional to 397.20, 595.90 and 328.05 is: 492.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    397.20 : 595.90 = 328.05 : x
  2. Step 2: Convert to fraction form
    397.20/595.90 = 328.05/x
  3. Step 3: Cross multiply
    397.20x = 595.90 × 328.05
  4. Step 4: Simplify right side
    397.20x = 195,482.02
  5. Step 5: Solve for x
    x = 195,482.02/397.20
  6. Step 6: Final answer
    x = 492.15

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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.