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Finding the Fourth Proportional to 718.58, 1,077.79 and 198.62

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Solution

The fourth proportional to 718.58, 1,077.79 and 198.62 is: 297.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.58 : 1,077.79 = 198.62 : x
  2. Step 2: Convert to fraction form
    718.58/1,077.79 = 198.62/x
  3. Step 3: Cross multiply
    718.58x = 1,077.79 × 198.62
  4. Step 4: Simplify right side
    718.58x = 214,070.65
  5. Step 5: Solve for x
    x = 214,070.65/718.58
  6. Step 6: Final answer
    x = 297.91

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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.