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Finding the Fourth Proportional to 680.89, 939.63 and 370.39

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Solution

The fourth proportional to 680.89, 939.63 and 370.39 is: 511.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.89 : 939.63 = 370.39 : x
  2. Step 2: Convert to fraction form
    680.89/939.63 = 370.39/x
  3. Step 3: Cross multiply
    680.89x = 939.63 × 370.39
  4. Step 4: Simplify right side
    680.89x = 348,029.56
  5. Step 5: Solve for x
    x = 348,029.56/680.89
  6. Step 6: Final answer
    x = 511.14

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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.