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Finding the Fourth Proportional to 657.15, 905.82 and 644.19

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Solution

The fourth proportional to 657.15, 905.82 and 644.19 is: 887.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    657.15 : 905.82 = 644.19 : x
  2. Step 2: Convert to fraction form
    657.15/905.82 = 644.19/x
  3. Step 3: Cross multiply
    657.15x = 905.82 × 644.19
  4. Step 4: Simplify right side
    657.15x = 583,524.06
  5. Step 5: Solve for x
    x = 583,524.06/657.15
  6. Step 6: Final answer
    x = 887.96

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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.