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Finding the Fourth Proportional to 1,188.54, 1,640.70 and 790.80

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Solution

The fourth proportional to 1,188.54, 1,640.70 and 790.80 is: 1,091.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.54 : 1,640.70 = 790.80 : x
  2. Step 2: Convert to fraction form
    1,188.54/1,640.70 = 790.80/x
  3. Step 3: Cross multiply
    1,188.54x = 1,640.70 × 790.80
  4. Step 4: Simplify right side
    1,188.54x = 1,297,465.56
  5. Step 5: Solve for x
    x = 1,297,465.56/1,188.54
  6. Step 6: Final answer
    x = 1,091.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.