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Finding the Fourth Proportional to 1,139.22, 1,705.14 and 644.28

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Solution

The fourth proportional to 1,139.22, 1,705.14 and 644.28 is: 964.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.22 : 1,705.14 = 644.28 : x
  2. Step 2: Convert to fraction form
    1,139.22/1,705.14 = 644.28/x
  3. Step 3: Cross multiply
    1,139.22x = 1,705.14 × 644.28
  4. Step 4: Simplify right side
    1,139.22x = 1,098,587.60
  5. Step 5: Solve for x
    x = 1,098,587.60/1,139.22
  6. Step 6: Final answer
    x = 964.33

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.