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Finding the Fourth Proportional to 758.80, 1,138.20 and 483.40

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Solution

The fourth proportional to 758.80, 1,138.20 and 483.40 is: 725.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    758.80 : 1,138.20 = 483.40 : x
  2. Step 2: Convert to fraction form
    758.80/1,138.20 = 483.40/x
  3. Step 3: Cross multiply
    758.80x = 1,138.20 × 483.40
  4. Step 4: Simplify right side
    758.80x = 550,205.88
  5. Step 5: Solve for x
    x = 550,205.88/758.80
  6. Step 6: Final answer
    x = 725.10

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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.