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Finding the Fourth Proportional to 759.15, 1,139.09 and 320.51

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Solution

The fourth proportional to 759.15, 1,139.09 and 320.51 is: 480.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.15 : 1,139.09 = 320.51 : x
  2. Step 2: Convert to fraction form
    759.15/1,139.09 = 320.51/x
  3. Step 3: Cross multiply
    759.15x = 1,139.09 × 320.51
  4. Step 4: Simplify right side
    759.15x = 365,084.04
  5. Step 5: Solve for x
    x = 365,084.04/759.15
  6. Step 6: Final answer
    x = 480.91

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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.