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Finding the Fourth Proportional to 455.34, 627.71 and 315.25

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Solution

The fourth proportional to 455.34, 627.71 and 315.25 is: 434.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.34 : 627.71 = 315.25 : x
  2. Step 2: Convert to fraction form
    455.34/627.71 = 315.25/x
  3. Step 3: Cross multiply
    455.34x = 627.71 × 315.25
  4. Step 4: Simplify right side
    455.34x = 197,885.58
  5. Step 5: Solve for x
    x = 197,885.58/455.34
  6. Step 6: Final answer
    x = 434.59

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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.