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Finding the Fourth Proportional to 680.30, 939.60 and 540.86

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Solution

The fourth proportional to 680.30, 939.60 and 540.86 is: 747.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    680.30 : 939.60 = 540.86 : x
  2. Step 2: Convert to fraction form
    680.30/939.60 = 540.86/x
  3. Step 3: Cross multiply
    680.30x = 939.60 × 540.86
  4. Step 4: Simplify right side
    680.30x = 508,192.06
  5. Step 5: Solve for x
    x = 508,192.06/680.30
  6. Step 6: Final answer
    x = 747.01

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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.