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Finding the Fourth Proportional to 759.12, 1,139 and 320.48

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Solution

The fourth proportional to 759.12, 1,139 and 320.48 is: 480.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.12 : 1,139 = 320.48 : x
  2. Step 2: Convert to fraction form
    759.12/1,139 = 320.48/x
  3. Step 3: Cross multiply
    759.12x = 1,139 × 320.48
  4. Step 4: Simplify right side
    759.12x = 365,026.72
  5. Step 5: Solve for x
    x = 365,026.72/759.12
  6. Step 6: Final answer
    x = 480.86

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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.