Home / 1,276.25-1,913.36-660.05

Finding the Fourth Proportional to 1,276.25, 1,913.36 and 660.05

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Solution

The fourth proportional to 1,276.25, 1,913.36 and 660.05 is: 989.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,276.25 : 1,913.36 = 660.05 : x
  2. Step 2: Convert to fraction form
    1,276.25/1,913.36 = 660.05/x
  3. Step 3: Cross multiply
    1,276.25x = 1,913.36 × 660.05
  4. Step 4: Simplify right side
    1,276.25x = 1,262,903.70
  5. Step 5: Solve for x
    x = 1,262,903.70/1,276.25
  6. Step 6: Final answer
    x = 989.54

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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.