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Finding the Fourth Proportional to 644.28, 888.57 and 423.06

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Solution

The fourth proportional to 644.28, 888.57 and 423.06 is: 583.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.28 : 888.57 = 423.06 : x
  2. Step 2: Convert to fraction form
    644.28/888.57 = 423.06/x
  3. Step 3: Cross multiply
    644.28x = 888.57 × 423.06
  4. Step 4: Simplify right side
    644.28x = 375,918.42
  5. Step 5: Solve for x
    x = 375,918.42/644.28
  6. Step 6: Final answer
    x = 583.47

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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.