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Finding the Fourth Proportional to 389.44, 583.98 and 145.79

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Solution

The fourth proportional to 389.44, 583.98 and 145.79 is: 218.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.44 : 583.98 = 145.79 : x
  2. Step 2: Convert to fraction form
    389.44/583.98 = 145.79/x
  3. Step 3: Cross multiply
    389.44x = 583.98 × 145.79
  4. Step 4: Simplify right side
    389.44x = 85,138.44
  5. Step 5: Solve for x
    x = 85,138.44/389.44
  6. Step 6: Final answer
    x = 218.62

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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.