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Finding the Fourth Proportional to 680.85, 939.89 and 457.16

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Solution

The fourth proportional to 680.85, 939.89 and 457.16 is: 631.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.85 : 939.89 = 457.16 : x
  2. Step 2: Convert to fraction form
    680.85/939.89 = 457.16/x
  3. Step 3: Cross multiply
    680.85x = 939.89 × 457.16
  4. Step 4: Simplify right side
    680.85x = 429,676.56
  5. Step 5: Solve for x
    x = 429,676.56/680.85
  6. Step 6: Final answer
    x = 631.09

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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.