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Finding the Fourth Proportional to 1,190.96, 1,641.20 and 858.75

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Solution

The fourth proportional to 1,190.96, 1,641.20 and 858.75 is: 1,183.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,190.96 : 1,641.20 = 858.75 : x
  2. Step 2: Convert to fraction form
    1,190.96/1,641.20 = 858.75/x
  3. Step 3: Cross multiply
    1,190.96x = 1,641.20 × 858.75
  4. Step 4: Simplify right side
    1,190.96x = 1,409,376.21
  5. Step 5: Solve for x
    x = 1,409,376.21/1,190.96
  6. Step 6: Final answer
    x = 1,183.40

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.