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Finding the Fourth Proportional to 1,278.11, 1,915.47 and 546.77

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Solution

The fourth proportional to 1,278.11, 1,915.47 and 546.77 is: 819.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.11 : 1,915.47 = 546.77 : x
  2. Step 2: Convert to fraction form
    1,278.11/1,915.47 = 546.77/x
  3. Step 3: Cross multiply
    1,278.11x = 1,915.47 × 546.77
  4. Step 4: Simplify right side
    1,278.11x = 1,047,311.95
  5. Step 5: Solve for x
    x = 1,047,311.95/1,278.11
  6. Step 6: Final answer
    x = 819.43

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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.