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Finding the Fourth Proportional to 719.67, 1,081.43 and 390.83

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Solution

The fourth proportional to 719.67, 1,081.43 and 390.83 is: 587.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.67 : 1,081.43 = 390.83 : x
  2. Step 2: Convert to fraction form
    719.67/1,081.43 = 390.83/x
  3. Step 3: Cross multiply
    719.67x = 1,081.43 × 390.83
  4. Step 4: Simplify right side
    719.67x = 422,647.93
  5. Step 5: Solve for x
    x = 422,647.93/719.67
  6. Step 6: Final answer
    x = 587.28

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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.