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Finding the Fourth Proportional to 644.13, 889.47 and 520.47

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Solution

The fourth proportional to 644.13, 889.47 and 520.47 is: 718.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.13 : 889.47 = 520.47 : x
  2. Step 2: Convert to fraction form
    644.13/889.47 = 520.47/x
  3. Step 3: Cross multiply
    644.13x = 889.47 × 520.47
  4. Step 4: Simplify right side
    644.13x = 462,942.45
  5. Step 5: Solve for x
    x = 462,942.45/644.13
  6. Step 6: Final answer
    x = 718.71

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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.