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Finding the Fourth Proportional to 768.60, 1,151.86 and 719.39

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Solution

The fourth proportional to 768.60, 1,151.86 and 719.39 is: 1,078.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.60 : 1,151.86 = 719.39 : x
  2. Step 2: Convert to fraction form
    768.60/1,151.86 = 719.39/x
  3. Step 3: Cross multiply
    768.60x = 1,151.86 × 719.39
  4. Step 4: Simplify right side
    768.60x = 828,636.57
  5. Step 5: Solve for x
    x = 828,636.57/768.60
  6. Step 6: Final answer
    x = 1,078.11

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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.