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Finding the Fourth Proportional to 644.91, 889.99 and 382.93

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Solution

The fourth proportional to 644.91, 889.99 and 382.93 is: 528.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.91 : 889.99 = 382.93 : x
  2. Step 2: Convert to fraction form
    644.91/889.99 = 382.93/x
  3. Step 3: Cross multiply
    644.91x = 889.99 × 382.93
  4. Step 4: Simplify right side
    644.91x = 340,803.87
  5. Step 5: Solve for x
    x = 340,803.87/644.91
  6. Step 6: Final answer
    x = 528.45

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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.