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Finding the Fourth Proportional to 789.28, 1,088.39 and 649.24

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Solution

The fourth proportional to 789.28, 1,088.39 and 649.24 is: 895.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.28 : 1,088.39 = 649.24 : x
  2. Step 2: Convert to fraction form
    789.28/1,088.39 = 649.24/x
  3. Step 3: Cross multiply
    789.28x = 1,088.39 × 649.24
  4. Step 4: Simplify right side
    789.28x = 706,625.23
  5. Step 5: Solve for x
    x = 706,625.23/789.28
  6. Step 6: Final answer
    x = 895.28

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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.