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Finding the Fourth Proportional to 453.78, 682.47 and 389.97

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Solution

The fourth proportional to 453.78, 682.47 and 389.97 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.78 : 682.47 = 389.97 : x
  2. Step 2: Convert to fraction form
    453.78/682.47 = 389.97/x
  3. Step 3: Cross multiply
    453.78x = 682.47 × 389.97
  4. Step 4: Simplify right side
    453.78x = 266,142.83
  5. Step 5: Solve for x
    x = 266,142.83/453.78
  6. Step 6: Final answer
    x = 586.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.