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Finding the Fourth Proportional to 719.90, 1,080.57 and 395.42

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Solution

The fourth proportional to 719.90, 1,080.57 and 395.42 is: 593.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.90 : 1,080.57 = 395.42 : x
  2. Step 2: Convert to fraction form
    719.90/1,080.57 = 395.42/x
  3. Step 3: Cross multiply
    719.90x = 1,080.57 × 395.42
  4. Step 4: Simplify right side
    719.90x = 427,278.99
  5. Step 5: Solve for x
    x = 427,278.99/719.90
  6. Step 6: Final answer
    x = 593.53

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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.