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Finding the Fourth Proportional to 385.99, 578.81 and 125.94

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Solution

The fourth proportional to 385.99, 578.81 and 125.94 is: 188.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.99 : 578.81 = 125.94 : x
  2. Step 2: Convert to fraction form
    385.99/578.81 = 125.94/x
  3. Step 3: Cross multiply
    385.99x = 578.81 × 125.94
  4. Step 4: Simplify right side
    385.99x = 72,895.33
  5. Step 5: Solve for x
    x = 72,895.33/385.99
  6. Step 6: Final answer
    x = 188.85

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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.