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Finding the Fourth Proportional to 719.32, 992.72 and 439.60

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Solution

The fourth proportional to 719.32, 992.72 and 439.60 is: 606.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.32 : 992.72 = 439.60 : x
  2. Step 2: Convert to fraction form
    719.32/992.72 = 439.60/x
  3. Step 3: Cross multiply
    719.32x = 992.72 × 439.60
  4. Step 4: Simplify right side
    719.32x = 436,399.71
  5. Step 5: Solve for x
    x = 436,399.71/719.32
  6. Step 6: Final answer
    x = 606.68

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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.