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Finding the Fourth Proportional to 919.83, 1,269.84 and 709.54

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Solution

The fourth proportional to 919.83, 1,269.84 and 709.54 is: 979.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.83 : 1,269.84 = 709.54 : x
  2. Step 2: Convert to fraction form
    919.83/1,269.84 = 709.54/x
  3. Step 3: Cross multiply
    919.83x = 1,269.84 × 709.54
  4. Step 4: Simplify right side
    919.83x = 900,998.92
  5. Step 5: Solve for x
    x = 900,998.92/919.83
  6. Step 6: Final answer
    x = 979.52

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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.