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Finding the Fourth Proportional to 685.89, 940.18 and 676.66

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Solution

The fourth proportional to 685.89, 940.18 and 676.66 is: 927.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.89 : 940.18 = 676.66 : x
  2. Step 2: Convert to fraction form
    685.89/940.18 = 676.66/x
  3. Step 3: Cross multiply
    685.89x = 940.18 × 676.66
  4. Step 4: Simplify right side
    685.89x = 636,178.82
  5. Step 5: Solve for x
    x = 636,178.82/685.89
  6. Step 6: Final answer
    x = 927.52

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.