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Finding the Fourth Proportional to 431.01, 646.43 and 122.85

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Solution

The fourth proportional to 431.01, 646.43 and 122.85 is: 184.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.01 : 646.43 = 122.85 : x
  2. Step 2: Convert to fraction form
    431.01/646.43 = 122.85/x
  3. Step 3: Cross multiply
    431.01x = 646.43 × 122.85
  4. Step 4: Simplify right side
    431.01x = 79,413.31
  5. Step 5: Solve for x
    x = 79,413.31/431.01
  6. Step 6: Final answer
    x = 184.25

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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.