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Finding the Fourth Proportional to 1,276.83, 1,915.50 and 546.39

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Solution

The fourth proportional to 1,276.83, 1,915.50 and 546.39 is: 819.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.83 : 1,915.50 = 546.39 : x
  2. Step 2: Convert to fraction form
    1,276.83/1,915.50 = 546.39/x
  3. Step 3: Cross multiply
    1,276.83x = 1,915.50 × 546.39
  4. Step 4: Simplify right side
    1,276.83x = 1,046,610.05
  5. Step 5: Solve for x
    x = 1,046,610.05/1,276.83
  6. Step 6: Final answer
    x = 819.69

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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.