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Finding the Fourth Proportional to 778.94, 1,073.46 and 557.51

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Solution

The fourth proportional to 778.94, 1,073.46 and 557.51 is: 768.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.94 : 1,073.46 = 557.51 : x
  2. Step 2: Convert to fraction form
    778.94/1,073.46 = 557.51/x
  3. Step 3: Cross multiply
    778.94x = 1,073.46 × 557.51
  4. Step 4: Simplify right side
    778.94x = 598,464.68
  5. Step 5: Solve for x
    x = 598,464.68/778.94
  6. Step 6: Final answer
    x = 768.31

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1.5x scale

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.