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Finding the Fourth Proportional to 719.04, 990 and 571.44

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Solution

The fourth proportional to 719.04, 990 and 571.44 is: 786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.04 : 990 = 571.44 : x
  2. Step 2: Convert to fraction form
    719.04/990 = 571.44/x
  3. Step 3: Cross multiply
    719.04x = 990 × 571.44
  4. Step 4: Simplify right side
    719.04x = 565,725.60
  5. Step 5: Solve for x
    x = 565,725.60/719.04
  6. Step 6: Final answer
    x = 786.78

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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.