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Finding the Fourth Proportional to 385.54, 578.32 and 125.57

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Solution

The fourth proportional to 385.54, 578.32 and 125.57 is: 188.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.54 : 578.32 = 125.57 : x
  2. Step 2: Convert to fraction form
    385.54/578.32 = 125.57/x
  3. Step 3: Cross multiply
    385.54x = 578.32 × 125.57
  4. Step 4: Simplify right side
    385.54x = 72,619.64
  5. Step 5: Solve for x
    x = 72,619.64/385.54
  6. Step 6: Final answer
    x = 188.36

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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.