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Finding the Fourth Proportional to 389.19, 583.97 and 145.74

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Solution

The fourth proportional to 389.19, 583.97 and 145.74 is: 218.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.19 : 583.97 = 145.74 : x
  2. Step 2: Convert to fraction form
    389.19/583.97 = 145.74/x
  3. Step 3: Cross multiply
    389.19x = 583.97 × 145.74
  4. Step 4: Simplify right side
    389.19x = 85,104.87
  5. Step 5: Solve for x
    x = 85,104.87/389.19
  6. Step 6: Final answer
    x = 218.67

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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.