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Finding the Fourth Proportional to 554.67, 830.20 and 408.39

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Solution

The fourth proportional to 554.67, 830.20 and 408.39 is: 611.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.67 : 830.20 = 408.39 : x
  2. Step 2: Convert to fraction form
    554.67/830.20 = 408.39/x
  3. Step 3: Cross multiply
    554.67x = 830.20 × 408.39
  4. Step 4: Simplify right side
    554.67x = 339,041.23
  5. Step 5: Solve for x
    x = 339,041.23/554.67
  6. Step 6: Final answer
    x = 611.25

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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.