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Finding the Fourth Proportional to 778.13, 1,073.81 and 428.81

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Solution

The fourth proportional to 778.13, 1,073.81 and 428.81 is: 591.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.13 : 1,073.81 = 428.81 : x
  2. Step 2: Convert to fraction form
    778.13/1,073.81 = 428.81/x
  3. Step 3: Cross multiply
    778.13x = 1,073.81 × 428.81
  4. Step 4: Simplify right side
    778.13x = 460,464.22
  5. Step 5: Solve for x
    x = 460,464.22/778.13
  6. Step 6: Final answer
    x = 591.76

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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.