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Finding the Fourth Proportional to 644.80, 889.74 and 382.76

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Solution

The fourth proportional to 644.80, 889.74 and 382.76 is: 528.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.80 : 889.74 = 382.76 : x
  2. Step 2: Convert to fraction form
    644.80/889.74 = 382.76/x
  3. Step 3: Cross multiply
    644.80x = 889.74 × 382.76
  4. Step 4: Simplify right side
    644.80x = 340,556.88
  5. Step 5: Solve for x
    x = 340,556.88/644.80
  6. Step 6: Final answer
    x = 528.16

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1.5x scale

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.