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Finding the Fourth Proportional to 1,015, 1,522.70 and 321.77

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Solution

The fourth proportional to 1,015, 1,522.70 and 321.77 is: 482.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,015 : 1,522.70 = 321.77 : x
  2. Step 2: Convert to fraction form
    1,015/1,522.70 = 321.77/x
  3. Step 3: Cross multiply
    1,015x = 1,522.70 × 321.77
  4. Step 4: Simplify right side
    1,015x = 489,959.18
  5. Step 5: Solve for x
    x = 489,959.18/1,015
  6. Step 6: Final answer
    x = 482.72

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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.