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Finding the Fourth Proportional to 1,539.80, 2,308.92 and 759.86

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Solution

The fourth proportional to 1,539.80, 2,308.92 and 759.86 is: 1,139.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,539.80 : 2,308.92 = 759.86 : x
  2. Step 2: Convert to fraction form
    1,539.80/2,308.92 = 759.86/x
  3. Step 3: Cross multiply
    1,539.80x = 2,308.92 × 759.86
  4. Step 4: Simplify right side
    1,539.80x = 1,754,455.95
  5. Step 5: Solve for x
    x = 1,754,455.95/1,539.80
  6. Step 6: Final answer
    x = 1,139.41

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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.