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Finding the Fourth Proportional to 1,277.86, 1,912.67 and 660.71

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Solution

The fourth proportional to 1,277.86, 1,912.67 and 660.71 is: 988.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.86 : 1,912.67 = 660.71 : x
  2. Step 2: Convert to fraction form
    1,277.86/1,912.67 = 660.71/x
  3. Step 3: Cross multiply
    1,277.86x = 1,912.67 × 660.71
  4. Step 4: Simplify right side
    1,277.86x = 1,263,720.20
  5. Step 5: Solve for x
    x = 1,263,720.20/1,277.86
  6. Step 6: Final answer
    x = 988.93

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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.