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Finding the Fourth Proportional to 719.04, 991.89 and 420.33

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Solution

The fourth proportional to 719.04, 991.89 and 420.33 is: 579.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.04 : 991.89 = 420.33 : x
  2. Step 2: Convert to fraction form
    719.04/991.89 = 420.33/x
  3. Step 3: Cross multiply
    719.04x = 991.89 × 420.33
  4. Step 4: Simplify right side
    719.04x = 416,921.12
  5. Step 5: Solve for x
    x = 416,921.12/719.04
  6. Step 6: Final answer
    x = 579.83

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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.