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Finding the Fourth Proportional to 680.96, 940.40 and 615.04

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Solution

The fourth proportional to 680.96, 940.40 and 615.04 is: 849.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.96 : 940.40 = 615.04 : x
  2. Step 2: Convert to fraction form
    680.96/940.40 = 615.04/x
  3. Step 3: Cross multiply
    680.96x = 940.40 × 615.04
  4. Step 4: Simplify right side
    680.96x = 578,383.62
  5. Step 5: Solve for x
    x = 578,383.62/680.96
  6. Step 6: Final answer
    x = 849.37

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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.