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Finding the Fourth Proportional to 719.18, 992.43 and 486.38

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Solution

The fourth proportional to 719.18, 992.43 and 486.38 is: 671.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.18 : 992.43 = 486.38 : x
  2. Step 2: Convert to fraction form
    719.18/992.43 = 486.38/x
  3. Step 3: Cross multiply
    719.18x = 992.43 × 486.38
  4. Step 4: Simplify right side
    719.18x = 482,698.10
  5. Step 5: Solve for x
    x = 482,698.10/719.18
  6. Step 6: Final answer
    x = 671.18

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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.