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Finding the Fourth Proportional to 719.79, 992.96 and 691.84

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Solution

The fourth proportional to 719.79, 992.96 and 691.84 is: 954.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.79 : 992.96 = 691.84 : x
  2. Step 2: Convert to fraction form
    719.79/992.96 = 691.84/x
  3. Step 3: Cross multiply
    719.79x = 992.96 × 691.84
  4. Step 4: Simplify right side
    719.79x = 686,969.82
  5. Step 5: Solve for x
    x = 686,969.82/719.79
  6. Step 6: Final answer
    x = 954.41

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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.