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Finding the Fourth Proportional to 655.91, 899.27 and 644.21

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Solution

The fourth proportional to 655.91, 899.27 and 644.21 is: 883.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    655.91 : 899.27 = 644.21 : x
  2. Step 2: Convert to fraction form
    655.91/899.27 = 644.21/x
  3. Step 3: Cross multiply
    655.91x = 899.27 × 644.21
  4. Step 4: Simplify right side
    655.91x = 579,311.01
  5. Step 5: Solve for x
    x = 579,311.01/655.91
  6. Step 6: Final answer
    x = 883.22

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.