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Finding the Fourth Proportional to 389.60, 584.33 and 142.75

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Solution

The fourth proportional to 389.60, 584.33 and 142.75 is: 214.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.60 : 584.33 = 142.75 : x
  2. Step 2: Convert to fraction form
    389.60/584.33 = 142.75/x
  3. Step 3: Cross multiply
    389.60x = 584.33 × 142.75
  4. Step 4: Simplify right side
    389.60x = 83,413.11
  5. Step 5: Solve for x
    x = 83,413.11/389.60
  6. Step 6: Final answer
    x = 214.10

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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.