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Finding the Fourth Proportional to 719.21, 992.43 and 424.43

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Solution

The fourth proportional to 719.21, 992.43 and 424.43 is: 585.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.21 : 992.43 = 424.43 : x
  2. Step 2: Convert to fraction form
    719.21/992.43 = 424.43/x
  3. Step 3: Cross multiply
    719.21x = 992.43 × 424.43
  4. Step 4: Simplify right side
    719.21x = 421,212.10
  5. Step 5: Solve for x
    x = 421,212.10/719.21
  6. Step 6: Final answer
    x = 585.66

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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.