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Finding the Fourth Proportional to 455.64, 628.68 and 289.92

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Solution

The fourth proportional to 455.64, 628.68 and 289.92 is: 400.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.64 : 628.68 = 289.92 : x
  2. Step 2: Convert to fraction form
    455.64/628.68 = 289.92/x
  3. Step 3: Cross multiply
    455.64x = 628.68 × 289.92
  4. Step 4: Simplify right side
    455.64x = 182,266.91
  5. Step 5: Solve for x
    x = 182,266.91/455.64
  6. Step 6: Final answer
    x = 400.02

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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.