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Finding the Fourth Proportional to 455.99, 628.88 and 385.44

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Solution

The fourth proportional to 455.99, 628.88 and 385.44 is: 531.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.99 : 628.88 = 385.44 : x
  2. Step 2: Convert to fraction form
    455.99/628.88 = 385.44/x
  3. Step 3: Cross multiply
    455.99x = 628.88 × 385.44
  4. Step 4: Simplify right side
    455.99x = 242,395.51
  5. Step 5: Solve for x
    x = 242,395.51/455.99
  6. Step 6: Final answer
    x = 531.58

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.