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Finding the Fourth Proportional to 385.63, 578.40 and 364.21

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Solution

The fourth proportional to 385.63, 578.40 and 364.21 is: 546.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    385.63 : 578.40 = 364.21 : x
  2. Step 2: Convert to fraction form
    385.63/578.40 = 364.21/x
  3. Step 3: Cross multiply
    385.63x = 578.40 × 364.21
  4. Step 4: Simplify right side
    385.63x = 210,659.06
  5. Step 5: Solve for x
    x = 210,659.06/385.63
  6. Step 6: Final answer
    x = 546.27

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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.