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Finding the Fourth Proportional to 569.39, 785.70 and 320.75

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Solution

The fourth proportional to 569.39, 785.70 and 320.75 is: 442.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.39 : 785.70 = 320.75 : x
  2. Step 2: Convert to fraction form
    569.39/785.70 = 320.75/x
  3. Step 3: Cross multiply
    569.39x = 785.70 × 320.75
  4. Step 4: Simplify right side
    569.39x = 252,009.35
  5. Step 5: Solve for x
    x = 252,009.35/569.39
  6. Step 6: Final answer
    x = 442.60

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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.