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Finding the Fourth Proportional to 644.09, 887.63 and 591.71

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Solution

The fourth proportional to 644.09, 887.63 and 591.71 is: 815.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.09 : 887.63 = 591.71 : x
  2. Step 2: Convert to fraction form
    644.09/887.63 = 591.71/x
  3. Step 3: Cross multiply
    644.09x = 887.63 × 591.71
  4. Step 4: Simplify right side
    644.09x = 525,212.15
  5. Step 5: Solve for x
    x = 525,212.15/644.09
  6. Step 6: Final answer
    x = 815.44

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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.