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Finding the Fourth Proportional to 997.79, 1,496.71 and 381.39

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Solution

The fourth proportional to 997.79, 1,496.71 and 381.39 is: 572.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    997.79 : 1,496.71 = 381.39 : x
  2. Step 2: Convert to fraction form
    997.79/1,496.71 = 381.39/x
  3. Step 3: Cross multiply
    997.79x = 1,496.71 × 381.39
  4. Step 4: Simplify right side
    997.79x = 570,833.51
  5. Step 5: Solve for x
    x = 570,833.51/997.79
  6. Step 6: Final answer
    x = 572.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.