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Finding the Fourth Proportional to 1,016.94, 1,403.64 and 644.28

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Solution

The fourth proportional to 1,016.94, 1,403.64 and 644.28 is: 889.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,016.94 : 1,403.64 = 644.28 : x
  2. Step 2: Convert to fraction form
    1,016.94/1,403.64 = 644.28/x
  3. Step 3: Cross multiply
    1,016.94x = 1,403.64 × 644.28
  4. Step 4: Simplify right side
    1,016.94x = 904,337.18
  5. Step 5: Solve for x
    x = 904,337.18/1,016.94
  6. Step 6: Final answer
    x = 889.27

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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.