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Finding the Fourth Proportional to 569.79, 786.38 and 321.12

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Solution

The fourth proportional to 569.79, 786.38 and 321.12 is: 443.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.79 : 786.38 = 321.12 : x
  2. Step 2: Convert to fraction form
    569.79/786.38 = 321.12/x
  3. Step 3: Cross multiply
    569.79x = 786.38 × 321.12
  4. Step 4: Simplify right side
    569.79x = 252,520.74
  5. Step 5: Solve for x
    x = 252,520.74/569.79
  6. Step 6: Final answer
    x = 443.18

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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.