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Finding the Fourth Proportional to 1,278.25, 1,917.36 and 845.30

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Solution

The fourth proportional to 1,278.25, 1,917.36 and 845.30 is: 1,267.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.25 : 1,917.36 = 845.30 : x
  2. Step 2: Convert to fraction form
    1,278.25/1,917.36 = 845.30/x
  3. Step 3: Cross multiply
    1,278.25x = 1,917.36 × 845.30
  4. Step 4: Simplify right side
    1,278.25x = 1,620,744.41
  5. Step 5: Solve for x
    x = 1,620,744.41/1,278.25
  6. Step 6: Final answer
    x = 1,267.95

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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.