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Finding the Fourth Proportional to 680.60, 938.84 and 493.88

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Solution

The fourth proportional to 680.60, 938.84 and 493.88 is: 681.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.60 : 938.84 = 493.88 : x
  2. Step 2: Convert to fraction form
    680.60/938.84 = 493.88/x
  3. Step 3: Cross multiply
    680.60x = 938.84 × 493.88
  4. Step 4: Simplify right side
    680.60x = 463,667.14
  5. Step 5: Solve for x
    x = 463,667.14/680.60
  6. Step 6: Final answer
    x = 681.26

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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.