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Finding the Fourth Proportional to 455.74, 627.35 and 397.42

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Solution

The fourth proportional to 455.74, 627.35 and 397.42 is: 547.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.74 : 627.35 = 397.42 : x
  2. Step 2: Convert to fraction form
    455.74/627.35 = 397.42/x
  3. Step 3: Cross multiply
    455.74x = 627.35 × 397.42
  4. Step 4: Simplify right side
    455.74x = 249,321.44
  5. Step 5: Solve for x
    x = 249,321.44/455.74
  6. Step 6: Final answer
    x = 547.07

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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.