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Finding the Fourth Proportional to 1,279.95, 1,910.54 and 1,276.71

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Solution

The fourth proportional to 1,279.95, 1,910.54 and 1,276.71 is: 1,905.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.95 : 1,910.54 = 1,276.71 : x
  2. Step 2: Convert to fraction form
    1,279.95/1,910.54 = 1,276.71/x
  3. Step 3: Cross multiply
    1,279.95x = 1,910.54 × 1,276.71
  4. Step 4: Simplify right side
    1,279.95x = 2,439,199.14
  5. Step 5: Solve for x
    x = 2,439,199.14/1,279.95
  6. Step 6: Final answer
    x = 1,905.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.