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Finding the Fourth Proportional to 915.35, 1,263.21 and 522.38

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Solution

The fourth proportional to 915.35, 1,263.21 and 522.38 is: 720.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.35 : 1,263.21 = 522.38 : x
  2. Step 2: Convert to fraction form
    915.35/1,263.21 = 522.38/x
  3. Step 3: Cross multiply
    915.35x = 1,263.21 × 522.38
  4. Step 4: Simplify right side
    915.35x = 659,875.64
  5. Step 5: Solve for x
    x = 659,875.64/915.35
  6. Step 6: Final answer
    x = 720.90

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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.