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Finding the Fourth Proportional to 1,187.30, 1,636.94 and 813.61

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Solution

The fourth proportional to 1,187.30, 1,636.94 and 813.61 is: 1,121.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,187.30 : 1,636.94 = 813.61 : x
  2. Step 2: Convert to fraction form
    1,187.30/1,636.94 = 813.61/x
  3. Step 3: Cross multiply
    1,187.30x = 1,636.94 × 813.61
  4. Step 4: Simplify right side
    1,187.30x = 1,331,826.81
  5. Step 5: Solve for x
    x = 1,331,826.81/1,187.30
  6. Step 6: Final answer
    x = 1,121.73

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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.