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Finding the Fourth Proportional to 455.22, 628.56 and 307.80

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Solution

The fourth proportional to 455.22, 628.56 and 307.80 is: 425.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.22 : 628.56 = 307.80 : x
  2. Step 2: Convert to fraction form
    455.22/628.56 = 307.80/x
  3. Step 3: Cross multiply
    455.22x = 628.56 × 307.80
  4. Step 4: Simplify right side
    455.22x = 193,470.77
  5. Step 5: Solve for x
    x = 193,470.77/455.22
  6. Step 6: Final answer
    x = 425.00

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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.