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Finding the Fourth Proportional to 961.56, 1,321.19 and 764.73

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Solution

The fourth proportional to 961.56, 1,321.19 and 764.73 is: 1,050.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    961.56 : 1,321.19 = 764.73 : x
  2. Step 2: Convert to fraction form
    961.56/1,321.19 = 764.73/x
  3. Step 3: Cross multiply
    961.56x = 1,321.19 × 764.73
  4. Step 4: Simplify right side
    961.56x = 1,010,349.81
  5. Step 5: Solve for x
    x = 1,010,349.81/961.56
  6. Step 6: Final answer
    x = 1,050.74

Related Problems

Find fourth proportional to 480.78, 660.59 and 382.37
Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.