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Finding the Fourth Proportional to 719.56, 1,078.14 and 513.80

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Solution

The fourth proportional to 719.56, 1,078.14 and 513.80 is: 769.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.56 : 1,078.14 = 513.80 : x
  2. Step 2: Convert to fraction form
    719.56/1,078.14 = 513.80/x
  3. Step 3: Cross multiply
    719.56x = 1,078.14 × 513.80
  4. Step 4: Simplify right side
    719.56x = 553,948.33
  5. Step 5: Solve for x
    x = 553,948.33/719.56
  6. Step 6: Final answer
    x = 769.84

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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.