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Finding the Fourth Proportional to 685.26, 945.73 and 405.58

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Solution

The fourth proportional to 685.26, 945.73 and 405.58 is: 559.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.26 : 945.73 = 405.58 : x
  2. Step 2: Convert to fraction form
    685.26/945.73 = 405.58/x
  3. Step 3: Cross multiply
    685.26x = 945.73 × 405.58
  4. Step 4: Simplify right side
    685.26x = 383,569.47
  5. Step 5: Solve for x
    x = 383,569.47/685.26
  6. Step 6: Final answer
    x = 559.74

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1.5x scale

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.