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Finding the Fourth Proportional to 778.06, 1,073.67 and 428.74

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Solution

The fourth proportional to 778.06, 1,073.67 and 428.74 is: 591.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.06 : 1,073.67 = 428.74 : x
  2. Step 2: Convert to fraction form
    778.06/1,073.67 = 428.74/x
  3. Step 3: Cross multiply
    778.06x = 1,073.67 × 428.74
  4. Step 4: Simplify right side
    778.06x = 460,325.28
  5. Step 5: Solve for x
    x = 460,325.28/778.06
  6. Step 6: Final answer
    x = 591.63

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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.