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Finding the Fourth Proportional to 703.80, 963.48 and 679.20

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Solution

The fourth proportional to 703.80, 963.48 and 679.20 is: 929.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    703.80 : 963.48 = 679.20 : x
  2. Step 2: Convert to fraction form
    703.80/963.48 = 679.20/x
  3. Step 3: Cross multiply
    703.80x = 963.48 × 679.20
  4. Step 4: Simplify right side
    703.80x = 654,395.62
  5. Step 5: Solve for x
    x = 654,395.62/703.80
  6. Step 6: Final answer
    x = 929.80

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.