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Finding the Fourth Proportional to 719.15, 992.70 and 439.47

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Solution

The fourth proportional to 719.15, 992.70 and 439.47 is: 606.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.15 : 992.70 = 439.47 : x
  2. Step 2: Convert to fraction form
    719.15/992.70 = 439.47/x
  3. Step 3: Cross multiply
    719.15x = 992.70 × 439.47
  4. Step 4: Simplify right side
    719.15x = 436,261.87
  5. Step 5: Solve for x
    x = 436,261.87/719.15
  6. Step 6: Final answer
    x = 606.64

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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.