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Finding the Fourth Proportional to 458.31, 630.87 and 399.99

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Solution

The fourth proportional to 458.31, 630.87 and 399.99 is: 550.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    458.31 : 630.87 = 399.99 : x
  2. Step 2: Convert to fraction form
    458.31/630.87 = 399.99/x
  3. Step 3: Cross multiply
    458.31x = 630.87 × 399.99
  4. Step 4: Simplify right side
    458.31x = 252,341.69
  5. Step 5: Solve for x
    x = 252,341.69/458.31
  6. Step 6: Final answer
    x = 550.59

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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.