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Finding the Fourth Proportional to 779.25, 1,076.58 and 720.12

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Solution

The fourth proportional to 779.25, 1,076.58 and 720.12 is: 994.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.25 : 1,076.58 = 720.12 : x
  2. Step 2: Convert to fraction form
    779.25/1,076.58 = 720.12/x
  3. Step 3: Cross multiply
    779.25x = 1,076.58 × 720.12
  4. Step 4: Simplify right side
    779.25x = 775,266.79
  5. Step 5: Solve for x
    x = 775,266.79/779.25
  6. Step 6: Final answer
    x = 994.89

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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.