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Finding the Fourth Proportional to 569.85, 786.37 and 321.15

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Solution

The fourth proportional to 569.85, 786.37 and 321.15 is: 443.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.85 : 786.37 = 321.15 : x
  2. Step 2: Convert to fraction form
    569.85/786.37 = 321.15/x
  3. Step 3: Cross multiply
    569.85x = 786.37 × 321.15
  4. Step 4: Simplify right side
    569.85x = 252,541.12
  5. Step 5: Solve for x
    x = 252,541.12/569.85
  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.