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Finding the Fourth Proportional to 1,015.34, 1,522.32 and 321.78

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Solution

The fourth proportional to 1,015.34, 1,522.32 and 321.78 is: 482.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015.34 : 1,522.32 = 321.78 : x
  2. Step 2: Convert to fraction form
    1,015.34/1,522.32 = 321.78/x
  3. Step 3: Cross multiply
    1,015.34x = 1,522.32 × 321.78
  4. Step 4: Simplify right side
    1,015.34x = 489,852.13
  5. Step 5: Solve for x
    x = 489,852.13/1,015.34
  6. Step 6: Final answer
    x = 482.45

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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.