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Finding the Fourth Proportional to 1,277.76, 1,917.72 and 661.84

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Solution

The fourth proportional to 1,277.76, 1,917.72 and 661.84 is: 993.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.76 : 1,917.72 = 661.84 : x
  2. Step 2: Convert to fraction form
    1,277.76/1,917.72 = 661.84/x
  3. Step 3: Cross multiply
    1,277.76x = 1,917.72 × 661.84
  4. Step 4: Simplify right side
    1,277.76x = 1,269,223.80
  5. Step 5: Solve for x
    x = 1,269,223.80/1,277.76
  6. Step 6: Final answer
    x = 993.32

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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.