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Finding the Fourth Proportional to 680.76, 939 and 629.22

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Solution

The fourth proportional to 680.76, 939 and 629.22 is: 867.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.76 : 939 = 629.22 : x
  2. Step 2: Convert to fraction form
    680.76/939 = 629.22/x
  3. Step 3: Cross multiply
    680.76x = 939 × 629.22
  4. Step 4: Simplify right side
    680.76x = 590,837.58
  5. Step 5: Solve for x
    x = 590,837.58/680.76
  6. Step 6: Final answer
    x = 867.91

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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.