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Finding the Fourth Proportional to 759.07, 1,138.95 and 686.62

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Solution

The fourth proportional to 759.07, 1,138.95 and 686.62 is: 1,030.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.07 : 1,138.95 = 686.62 : x
  2. Step 2: Convert to fraction form
    759.07/1,138.95 = 686.62/x
  3. Step 3: Cross multiply
    759.07x = 1,138.95 × 686.62
  4. Step 4: Simplify right side
    759.07x = 782,025.85
  5. Step 5: Solve for x
    x = 782,025.85/759.07
  6. Step 6: Final answer
    x = 1,030.24

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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.