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Finding the Fourth Proportional to 569.28, 785.59 and 320.61

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Solution

The fourth proportional to 569.28, 785.59 and 320.61 is: 442.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    569.28 : 785.59 = 320.61 : x
  2. Step 2: Convert to fraction form
    569.28/785.59 = 320.61/x
  3. Step 3: Cross multiply
    569.28x = 785.59 × 320.61
  4. Step 4: Simplify right side
    569.28x = 251,868.01
  5. Step 5: Solve for x
    x = 251,868.01/569.28
  6. Step 6: Final answer
    x = 442.43

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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.