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Finding the Fourth Proportional to 455.52, 627.96 and 289.72

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Solution

The fourth proportional to 455.52, 627.96 and 289.72 is: 399.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.52 : 627.96 = 289.72 : x
  2. Step 2: Convert to fraction form
    455.52/627.96 = 289.72/x
  3. Step 3: Cross multiply
    455.52x = 627.96 × 289.72
  4. Step 4: Simplify right side
    455.52x = 181,932.57
  5. Step 5: Solve for x
    x = 181,932.57/455.52
  6. Step 6: Final answer
    x = 399.40

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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.