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Finding the Fourth Proportional to 455.45, 628.34 and 278.35

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Solution

The fourth proportional to 455.45, 628.34 and 278.35 is: 384.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.45 : 628.34 = 278.35 : x
  2. Step 2: Convert to fraction form
    455.45/628.34 = 278.35/x
  3. Step 3: Cross multiply
    455.45x = 628.34 × 278.35
  4. Step 4: Simplify right side
    455.45x = 174,898.44
  5. Step 5: Solve for x
    x = 174,898.44/455.45
  6. Step 6: Final answer
    x = 384.01

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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.