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Finding the Fourth Proportional to 778.81, 1,074.28 and 557.38

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Solution

The fourth proportional to 778.81, 1,074.28 and 557.38 is: 768.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.81 : 1,074.28 = 557.38 : x
  2. Step 2: Convert to fraction form
    778.81/1,074.28 = 557.38/x
  3. Step 3: Cross multiply
    778.81x = 1,074.28 × 557.38
  4. Step 4: Simplify right side
    778.81x = 598,782.19
  5. Step 5: Solve for x
    x = 598,782.19/778.81
  6. Step 6: Final answer
    x = 768.84

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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.