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Finding the Fourth Proportional to 759.88, 1,048.78 and 428.31

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Solution

The fourth proportional to 759.88, 1,048.78 and 428.31 is: 591.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.88 : 1,048.78 = 428.31 : x
  2. Step 2: Convert to fraction form
    759.88/1,048.78 = 428.31/x
  3. Step 3: Cross multiply
    759.88x = 1,048.78 × 428.31
  4. Step 4: Simplify right side
    759.88x = 449,197.72
  5. Step 5: Solve for x
    x = 449,197.72/759.88
  6. Step 6: Final answer
    x = 591.15

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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.