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Finding the Fourth Proportional to 1,147.31, 1,720.85 and 779.48

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Solution

The fourth proportional to 1,147.31, 1,720.85 and 779.48 is: 1,169.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.31 : 1,720.85 = 779.48 : x
  2. Step 2: Convert to fraction form
    1,147.31/1,720.85 = 779.48/x
  3. Step 3: Cross multiply
    1,147.31x = 1,720.85 × 779.48
  4. Step 4: Simplify right side
    1,147.31x = 1,341,355.66
  5. Step 5: Solve for x
    x = 1,341,355.66/1,147.31
  6. Step 6: Final answer
    x = 1,169.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.