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Finding the Fourth Proportional to 569.20, 785.39 and 320.43

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Solution

The fourth proportional to 569.20, 785.39 and 320.43 is: 442.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.20 : 785.39 = 320.43 : x
  2. Step 2: Convert to fraction form
    569.20/785.39 = 320.43/x
  3. Step 3: Cross multiply
    569.20x = 785.39 × 320.43
  4. Step 4: Simplify right side
    569.20x = 251,662.72
  5. Step 5: Solve for x
    x = 251,662.72/569.20
  6. Step 6: Final answer
    x = 442.13

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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.