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Finding the Fourth Proportional to 718.69, 990.74 and 519.65

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Solution

The fourth proportional to 718.69, 990.74 and 519.65 is: 716.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    718.69 : 990.74 = 519.65 : x
  2. Step 2: Convert to fraction form
    718.69/990.74 = 519.65/x
  3. Step 3: Cross multiply
    718.69x = 990.74 × 519.65
  4. Step 4: Simplify right side
    718.69x = 514,835.44
  5. Step 5: Solve for x
    x = 514,835.44/718.69
  6. Step 6: Final answer
    x = 716.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.