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Finding the Fourth Proportional to 464.90, 641.36 and 289.94

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Solution

The fourth proportional to 464.90, 641.36 and 289.94 is: 399.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    464.90 : 641.36 = 289.94 : x
  2. Step 2: Convert to fraction form
    464.90/641.36 = 289.94/x
  3. Step 3: Cross multiply
    464.90x = 641.36 × 289.94
  4. Step 4: Simplify right side
    464.90x = 185,955.92
  5. Step 5: Solve for x
    x = 185,955.92/464.90
  6. Step 6: Final answer
    x = 399.99

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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.