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Finding the Fourth Proportional to 644.51, 888.89 and 448.02

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Solution

The fourth proportional to 644.51, 888.89 and 448.02 is: 617.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    644.51 : 888.89 = 448.02 : x
  2. Step 2: Convert to fraction form
    644.51/888.89 = 448.02/x
  3. Step 3: Cross multiply
    644.51x = 888.89 × 448.02
  4. Step 4: Simplify right side
    644.51x = 398,238.26
  5. Step 5: Solve for x
    x = 398,238.26/644.51
  6. Step 6: Final answer
    x = 617.90

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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.