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Finding the Fourth Proportional to 759.80, 1,048.50 and 428.25

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Solution

The fourth proportional to 759.80, 1,048.50 and 428.25 is: 590.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.80 : 1,048.50 = 428.25 : x
  2. Step 2: Convert to fraction form
    759.80/1,048.50 = 428.25/x
  3. Step 3: Cross multiply
    759.80x = 1,048.50 × 428.25
  4. Step 4: Simplify right side
    759.80x = 449,020.13
  5. Step 5: Solve for x
    x = 449,020.13/759.80
  6. Step 6: Final answer
    x = 590.97

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.