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Finding the Fourth Proportional to 389.86, 584.88 and 146.50

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Solution

The fourth proportional to 389.86, 584.88 and 146.50 is: 219.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.86 : 584.88 = 146.50 : x
  2. Step 2: Convert to fraction form
    389.86/584.88 = 146.50/x
  3. Step 3: Cross multiply
    389.86x = 584.88 × 146.50
  4. Step 4: Simplify right side
    389.86x = 85,684.92
  5. Step 5: Solve for x
    x = 85,684.92/389.86
  6. Step 6: Final answer
    x = 219.78

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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.