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Finding the Fourth Proportional to 1,276.97, 1,915.56 and 815.69

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Solution

The fourth proportional to 1,276.97, 1,915.56 and 815.69 is: 1,223.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.97 : 1,915.56 = 815.69 : x
  2. Step 2: Convert to fraction form
    1,276.97/1,915.56 = 815.69/x
  3. Step 3: Cross multiply
    1,276.97x = 1,915.56 × 815.69
  4. Step 4: Simplify right side
    1,276.97x = 1,562,503.14
  5. Step 5: Solve for x
    x = 1,562,503.14/1,276.97
  6. Step 6: Final answer
    x = 1,223.60

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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.