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Finding the Fourth Proportional to 815.03, 1,221.49 and 522.42

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Solution

The fourth proportional to 815.03, 1,221.49 and 522.42 is: 782.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    815.03 : 1,221.49 = 522.42 : x
  2. Step 2: Convert to fraction form
    815.03/1,221.49 = 522.42/x
  3. Step 3: Cross multiply
    815.03x = 1,221.49 × 522.42
  4. Step 4: Simplify right side
    815.03x = 638,130.81
  5. Step 5: Solve for x
    x = 638,130.81/815.03
  6. Step 6: Final answer
    x = 782.95

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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.