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Finding the Fourth Proportional to 1,277.88, 1,917.18 and 661.92

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Solution

The fourth proportional to 1,277.88, 1,917.18 and 661.92 is: 993.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.88 : 1,917.18 = 661.92 : x
  2. Step 2: Convert to fraction form
    1,277.88/1,917.18 = 661.92/x
  3. Step 3: Cross multiply
    1,277.88x = 1,917.18 × 661.92
  4. Step 4: Simplify right side
    1,277.88x = 1,269,019.79
  5. Step 5: Solve for x
    x = 1,269,019.79/1,277.88
  6. Step 6: Final answer
    x = 993.07

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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.