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Finding the Fourth Proportional to 644.97, 889.07 and 411.69

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Solution

The fourth proportional to 644.97, 889.07 and 411.69 is: 567.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.97 : 889.07 = 411.69 : x
  2. Step 2: Convert to fraction form
    644.97/889.07 = 411.69/x
  3. Step 3: Cross multiply
    644.97x = 889.07 × 411.69
  4. Step 4: Simplify right side
    644.97x = 366,019.17
  5. Step 5: Solve for x
    x = 366,019.17/644.97
  6. Step 6: Final answer
    x = 567.50

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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.