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Finding the Fourth Proportional to 1,191.92, 1,638.96 and 1,155.44

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Solution

The fourth proportional to 1,191.92, 1,638.96 and 1,155.44 is: 1,588.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.92 : 1,638.96 = 1,155.44 : x
  2. Step 2: Convert to fraction form
    1,191.92/1,638.96 = 1,155.44/x
  3. Step 3: Cross multiply
    1,191.92x = 1,638.96 × 1,155.44
  4. Step 4: Simplify right side
    1,191.92x = 1,893,719.94
  5. Step 5: Solve for x
    x = 1,893,719.94/1,191.92
  6. Step 6: Final answer
    x = 1,588.80

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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.