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Finding the Fourth Proportional to 759.48, 1,139.31 and 348.74

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Solution

The fourth proportional to 759.48, 1,139.31 and 348.74 is: 523.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.48 : 1,139.31 = 348.74 : x
  2. Step 2: Convert to fraction form
    759.48/1,139.31 = 348.74/x
  3. Step 3: Cross multiply
    759.48x = 1,139.31 × 348.74
  4. Step 4: Simplify right side
    759.48x = 397,317.27
  5. Step 5: Solve for x
    x = 397,317.27/759.48
  6. Step 6: Final answer
    x = 523.14

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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.