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Finding the Fourth Proportional to 1,039.22, 1,433.64 and 619.34

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Solution

The fourth proportional to 1,039.22, 1,433.64 and 619.34 is: 854.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.22 : 1,433.64 = 619.34 : x
  2. Step 2: Convert to fraction form
    1,039.22/1,433.64 = 619.34/x
  3. Step 3: Cross multiply
    1,039.22x = 1,433.64 × 619.34
  4. Step 4: Simplify right side
    1,039.22x = 887,910.60
  5. Step 5: Solve for x
    x = 887,910.60/1,039.22
  6. Step 6: Final answer
    x = 854.40

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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.