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Finding the Fourth Proportional to 1,276.05, 1,912.95 and 754.77

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Solution

The fourth proportional to 1,276.05, 1,912.95 and 754.77 is: 1,131.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.05 : 1,912.95 = 754.77 : x
  2. Step 2: Convert to fraction form
    1,276.05/1,912.95 = 754.77/x
  3. Step 3: Cross multiply
    1,276.05x = 1,912.95 × 754.77
  4. Step 4: Simplify right side
    1,276.05x = 1,443,837.27
  5. Step 5: Solve for x
    x = 1,443,837.27/1,276.05
  6. Step 6: Final answer
    x = 1,131.49

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1.5x scale

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.