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Finding the Fourth Proportional to 389.37, 584.06 and 145.87

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Solution

The fourth proportional to 389.37, 584.06 and 145.87 is: 218.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.37 : 584.06 = 145.87 : x
  2. Step 2: Convert to fraction form
    389.37/584.06 = 145.87/x
  3. Step 3: Cross multiply
    389.37x = 584.06 × 145.87
  4. Step 4: Simplify right side
    389.37x = 85,195.46
  5. Step 5: Solve for x
    x = 85,195.46/389.37
  6. Step 6: Final answer
    x = 218.80

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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.