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Finding the Fourth Proportional to 1,129.86, 1,559.79 and 779.94

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Solution

The fourth proportional to 1,129.86, 1,559.79 and 779.94 is: 1,076.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.86 : 1,559.79 = 779.94 : x
  2. Step 2: Convert to fraction form
    1,129.86/1,559.79 = 779.94/x
  3. Step 3: Cross multiply
    1,129.86x = 1,559.79 × 779.94
  4. Step 4: Simplify right side
    1,129.86x = 1,216,542.61
  5. Step 5: Solve for x
    x = 1,216,542.61/1,129.86
  6. Step 6: Final answer
    x = 1,076.72

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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.