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Finding the Fourth Proportional to 688.56, 942.01 and 685.62

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Solution

The fourth proportional to 688.56, 942.01 and 685.62 is: 937.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    688.56 : 942.01 = 685.62 : x
  2. Step 2: Convert to fraction form
    688.56/942.01 = 685.62/x
  3. Step 3: Cross multiply
    688.56x = 942.01 × 685.62
  4. Step 4: Simplify right side
    688.56x = 645,860.90
  5. Step 5: Solve for x
    x = 645,860.90/688.56
  6. Step 6: Final answer
    x = 937.99

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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.