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Finding the Fourth Proportional to 759.96, 1,138.56 and 543.12

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Solution

The fourth proportional to 759.96, 1,138.56 and 543.12 is: 813.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.96 : 1,138.56 = 543.12 : x
  2. Step 2: Convert to fraction form
    759.96/1,138.56 = 543.12/x
  3. Step 3: Cross multiply
    759.96x = 1,138.56 × 543.12
  4. Step 4: Simplify right side
    759.96x = 618,374.71
  5. Step 5: Solve for x
    x = 618,374.71/759.96
  6. Step 6: Final answer
    x = 813.69

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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.