Home / 1,261.19-1,740.68-789.30

Finding the Fourth Proportional to 1,261.19, 1,740.68 and 789.30

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Solution

The fourth proportional to 1,261.19, 1,740.68 and 789.30 is: 1,089.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.19 : 1,740.68 = 789.30 : x
  2. Step 2: Convert to fraction form
    1,261.19/1,740.68 = 789.30/x
  3. Step 3: Cross multiply
    1,261.19x = 1,740.68 × 789.30
  4. Step 4: Simplify right side
    1,261.19x = 1,373,914.78
  5. Step 5: Solve for x
    x = 1,373,914.78/1,261.19
  6. Step 6: Final answer
    x = 1,089.38

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Half scale
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Double scale
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Similar ratio
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1.5x scale

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.