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Finding the Fourth Proportional to 719.81, 992.88 and 439.93

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Solution

The fourth proportional to 719.81, 992.88 and 439.93 is: 606.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.81 : 992.88 = 439.93 : x
  2. Step 2: Convert to fraction form
    719.81/992.88 = 439.93/x
  3. Step 3: Cross multiply
    719.81x = 992.88 × 439.93
  4. Step 4: Simplify right side
    719.81x = 436,800.18
  5. Step 5: Solve for x
    x = 436,800.18/719.81
  6. Step 6: Final answer
    x = 606.83

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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.