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Finding the Fourth Proportional to 680.76, 939.08 and 431.64

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Solution

The fourth proportional to 680.76, 939.08 and 431.64 is: 595.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.76 : 939.08 = 431.64 : x
  2. Step 2: Convert to fraction form
    680.76/939.08 = 431.64/x
  3. Step 3: Cross multiply
    680.76x = 939.08 × 431.64
  4. Step 4: Simplify right side
    680.76x = 405,344.49
  5. Step 5: Solve for x
    x = 405,344.49/680.76
  6. Step 6: Final answer
    x = 595.43

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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.