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Finding the Fourth Proportional to 759.08, 1,138.61 and 434.21

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Solution

The fourth proportional to 759.08, 1,138.61 and 434.21 is: 651.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.08 : 1,138.61 = 434.21 : x
  2. Step 2: Convert to fraction form
    759.08/1,138.61 = 434.21/x
  3. Step 3: Cross multiply
    759.08x = 1,138.61 × 434.21
  4. Step 4: Simplify right side
    759.08x = 494,399.78
  5. Step 5: Solve for x
    x = 494,399.78/759.08
  6. Step 6: Final answer
    x = 651.32

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1.5x scale

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.