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Finding the Fourth Proportional to 438.40, 605.12 and 351.04

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Solution

The fourth proportional to 438.40, 605.12 and 351.04 is: 484.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.40 : 605.12 = 351.04 : x
  2. Step 2: Convert to fraction form
    438.40/605.12 = 351.04/x
  3. Step 3: Cross multiply
    438.40x = 605.12 × 351.04
  4. Step 4: Simplify right side
    438.40x = 212,421.32
  5. Step 5: Solve for x
    x = 212,421.32/438.40
  6. Step 6: Final answer
    x = 484.54

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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.