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Finding the Fourth Proportional to 719.70, 993.18 and 400.65

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Solution

The fourth proportional to 719.70, 993.18 and 400.65 is: 552.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.70 : 993.18 = 400.65 : x
  2. Step 2: Convert to fraction form
    719.70/993.18 = 400.65/x
  3. Step 3: Cross multiply
    719.70x = 993.18 × 400.65
  4. Step 4: Simplify right side
    719.70x = 397,917.57
  5. Step 5: Solve for x
    x = 397,917.57/719.70
  6. Step 6: Final answer
    x = 552.89

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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.