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Finding the Fourth Proportional to 719.12, 1,078.54 and 198.99

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Solution

The fourth proportional to 719.12, 1,078.54 and 198.99 is: 298.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.12 : 1,078.54 = 198.99 : x
  2. Step 2: Convert to fraction form
    719.12/1,078.54 = 198.99/x
  3. Step 3: Cross multiply
    719.12x = 1,078.54 × 198.99
  4. Step 4: Simplify right side
    719.12x = 214,618.67
  5. Step 5: Solve for x
    x = 214,618.67/719.12
  6. Step 6: Final answer
    x = 298.45

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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.