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Finding the Fourth Proportional to 915.45, 1,263.39 and 522.39

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Solution

The fourth proportional to 915.45, 1,263.39 and 522.39 is: 720.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.45 : 1,263.39 = 522.39 : x
  2. Step 2: Convert to fraction form
    915.45/1,263.39 = 522.39/x
  3. Step 3: Cross multiply
    915.45x = 1,263.39 × 522.39
  4. Step 4: Simplify right side
    915.45x = 659,982.30
  5. Step 5: Solve for x
    x = 659,982.30/915.45
  6. Step 6: Final answer
    x = 720.94

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.