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Finding the Fourth Proportional to 778.12, 1,074.48 and 569.48

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Solution

The fourth proportional to 778.12, 1,074.48 and 569.48 is: 786.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.12 : 1,074.48 = 569.48 : x
  2. Step 2: Convert to fraction form
    778.12/1,074.48 = 569.48/x
  3. Step 3: Cross multiply
    778.12x = 1,074.48 × 569.48
  4. Step 4: Simplify right side
    778.12x = 611,894.87
  5. Step 5: Solve for x
    x = 611,894.87/778.12
  6. Step 6: Final answer
    x = 786.38

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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.