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Finding the Fourth Proportional to 1,019.76, 1,529.73 and 279.38

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Solution

The fourth proportional to 1,019.76, 1,529.73 and 279.38 is: 419.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.76 : 1,529.73 = 279.38 : x
  2. Step 2: Convert to fraction form
    1,019.76/1,529.73 = 279.38/x
  3. Step 3: Cross multiply
    1,019.76x = 1,529.73 × 279.38
  4. Step 4: Simplify right side
    1,019.76x = 427,375.97
  5. Step 5: Solve for x
    x = 427,375.97/1,019.76
  6. Step 6: Final answer
    x = 419.09

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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.