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Finding the Fourth Proportional to 1,019.78, 1,529.90 and 326.49

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Solution

The fourth proportional to 1,019.78, 1,529.90 and 326.49 is: 489.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,019.78 : 1,529.90 = 326.49 : x
  2. Step 2: Convert to fraction form
    1,019.78/1,529.90 = 326.49/x
  3. Step 3: Cross multiply
    1,019.78x = 1,529.90 × 326.49
  4. Step 4: Simplify right side
    1,019.78x = 499,495.42
  5. Step 5: Solve for x
    x = 499,495.42/1,019.78
  6. Step 6: Final answer
    x = 489.81

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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.