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Finding the Fourth Proportional to 680.72, 940.23 and 493.91

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Solution

The fourth proportional to 680.72, 940.23 and 493.91 is: 682.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.72 : 940.23 = 493.91 : x
  2. Step 2: Convert to fraction form
    680.72/940.23 = 493.91/x
  3. Step 3: Cross multiply
    680.72x = 940.23 × 493.91
  4. Step 4: Simplify right side
    680.72x = 464,384.30
  5. Step 5: Solve for x
    x = 464,384.30/680.72
  6. Step 6: Final answer
    x = 682.20

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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.