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Finding the Fourth Proportional to 455.50, 628.77 and 300.70

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Solution

The fourth proportional to 455.50, 628.77 and 300.70 is: 415.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.50 : 628.77 = 300.70 : x
  2. Step 2: Convert to fraction form
    455.50/628.77 = 300.70/x
  3. Step 3: Cross multiply
    455.50x = 628.77 × 300.70
  4. Step 4: Simplify right side
    455.50x = 189,071.14
  5. Step 5: Solve for x
    x = 189,071.14/455.50
  6. Step 6: Final answer
    x = 415.08

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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.