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Finding the Fourth Proportional to 389.48, 583.92 and 155.19

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Solution

The fourth proportional to 389.48, 583.92 and 155.19 is: 232.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.48 : 583.92 = 155.19 : x
  2. Step 2: Convert to fraction form
    389.48/583.92 = 155.19/x
  3. Step 3: Cross multiply
    389.48x = 583.92 × 155.19
  4. Step 4: Simplify right side
    389.48x = 90,618.54
  5. Step 5: Solve for x
    x = 90,618.54/389.48
  6. Step 6: Final answer
    x = 232.67

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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.