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Finding the Fourth Proportional to 915.57, 1,263.24 and 635.49

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Solution

The fourth proportional to 915.57, 1,263.24 and 635.49 is: 876.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    915.57 : 1,263.24 = 635.49 : x
  2. Step 2: Convert to fraction form
    915.57/1,263.24 = 635.49/x
  3. Step 3: Cross multiply
    915.57x = 1,263.24 × 635.49
  4. Step 4: Simplify right side
    915.57x = 802,776.39
  5. Step 5: Solve for x
    x = 802,776.39/915.57
  6. Step 6: Final answer
    x = 876.81

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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.