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Finding the Fourth Proportional to 644.25, 889.14 and 478.93

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Solution

The fourth proportional to 644.25, 889.14 and 478.93 is: 660.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.25 : 889.14 = 478.93 : x
  2. Step 2: Convert to fraction form
    644.25/889.14 = 478.93/x
  3. Step 3: Cross multiply
    644.25x = 889.14 × 478.93
  4. Step 4: Simplify right side
    644.25x = 425,835.82
  5. Step 5: Solve for x
    x = 425,835.82/644.25
  6. Step 6: Final answer
    x = 660.98

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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.