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Finding the Fourth Proportional to 644.56, 888.58 and 423.16

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Solution

The fourth proportional to 644.56, 888.58 and 423.16 is: 583.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.56 : 888.58 = 423.16 : x
  2. Step 2: Convert to fraction form
    644.56/888.58 = 423.16/x
  3. Step 3: Cross multiply
    644.56x = 888.58 × 423.16
  4. Step 4: Simplify right side
    644.56x = 376,011.51
  5. Step 5: Solve for x
    x = 376,011.51/644.56
  6. Step 6: Final answer
    x = 583.36

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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.