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Finding the Fourth Proportional to 436.05, 653.99 and 385.43

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Solution

The fourth proportional to 436.05, 653.99 and 385.43 is: 578.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.05 : 653.99 = 385.43 : x
  2. Step 2: Convert to fraction form
    436.05/653.99 = 385.43/x
  3. Step 3: Cross multiply
    436.05x = 653.99 × 385.43
  4. Step 4: Simplify right side
    436.05x = 252,062.17
  5. Step 5: Solve for x
    x = 252,062.17/436.05
  6. Step 6: Final answer
    x = 578.06

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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.