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Finding the Fourth Proportional to 758.70, 1,139.31 and 513.48

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Solution

The fourth proportional to 758.70, 1,139.31 and 513.48 is: 771.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.70 : 1,139.31 = 513.48 : x
  2. Step 2: Convert to fraction form
    758.70/1,139.31 = 513.48/x
  3. Step 3: Cross multiply
    758.70x = 1,139.31 × 513.48
  4. Step 4: Simplify right side
    758.70x = 585,012.90
  5. Step 5: Solve for x
    x = 585,012.90/758.70
  6. Step 6: Final answer
    x = 771.07

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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.