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Finding the Fourth Proportional to 644.81, 889.29 and 458.91

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Solution

The fourth proportional to 644.81, 889.29 and 458.91 is: 632.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.81 : 889.29 = 458.91 : x
  2. Step 2: Convert to fraction form
    644.81/889.29 = 458.91/x
  3. Step 3: Cross multiply
    644.81x = 889.29 × 458.91
  4. Step 4: Simplify right side
    644.81x = 408,104.07
  5. Step 5: Solve for x
    x = 408,104.07/644.81
  6. Step 6: Final answer
    x = 632.91

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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.