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Finding the Fourth Proportional to 1,280.19, 1,917.83 and 785.16

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Solution

The fourth proportional to 1,280.19, 1,917.83 and 785.16 is: 1,176.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.19 : 1,917.83 = 785.16 : x
  2. Step 2: Convert to fraction form
    1,280.19/1,917.83 = 785.16/x
  3. Step 3: Cross multiply
    1,280.19x = 1,917.83 × 785.16
  4. Step 4: Simplify right side
    1,280.19x = 1,505,793.27
  5. Step 5: Solve for x
    x = 1,505,793.27/1,280.19
  6. Step 6: Final answer
    x = 1,176.22

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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.