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Finding the Fourth Proportional to 681.80, 939.74 and 482.68

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Solution

The fourth proportional to 681.80, 939.74 and 482.68 is: 665.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.80 : 939.74 = 482.68 : x
  2. Step 2: Convert to fraction form
    681.80/939.74 = 482.68/x
  3. Step 3: Cross multiply
    681.80x = 939.74 × 482.68
  4. Step 4: Simplify right side
    681.80x = 453,593.70
  5. Step 5: Solve for x
    x = 453,593.70/681.80
  6. Step 6: Final answer
    x = 665.29

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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.