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Finding the Fourth Proportional to 385.76, 578.49 and 125.69

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Solution

The fourth proportional to 385.76, 578.49 and 125.69 is: 188.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.76 : 578.49 = 125.69 : x
  2. Step 2: Convert to fraction form
    385.76/578.49 = 125.69/x
  3. Step 3: Cross multiply
    385.76x = 578.49 × 125.69
  4. Step 4: Simplify right side
    385.76x = 72,711.85
  5. Step 5: Solve for x
    x = 72,711.85/385.76
  6. Step 6: Final answer
    x = 188.49

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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.