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Finding the Fourth Proportional to 759.59, 1,139.36 and 434.25

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Solution

The fourth proportional to 759.59, 1,139.36 and 434.25 is: 651.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.59 : 1,139.36 = 434.25 : x
  2. Step 2: Convert to fraction form
    759.59/1,139.36 = 434.25/x
  3. Step 3: Cross multiply
    759.59x = 1,139.36 × 434.25
  4. Step 4: Simplify right side
    759.59x = 494,764.91
  5. Step 5: Solve for x
    x = 494,764.91/759.59
  6. Step 6: Final answer
    x = 651.36

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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.