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Finding the Fourth Proportional to 1,191.58, 1,645.11 and 943.90

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Solution

The fourth proportional to 1,191.58, 1,645.11 and 943.90 is: 1,303.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.58 : 1,645.11 = 943.90 : x
  2. Step 2: Convert to fraction form
    1,191.58/1,645.11 = 943.90/x
  3. Step 3: Cross multiply
    1,191.58x = 1,645.11 × 943.90
  4. Step 4: Simplify right side
    1,191.58x = 1,552,819.33
  5. Step 5: Solve for x
    x = 1,552,819.33/1,191.58
  6. Step 6: Final answer
    x = 1,303.16

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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.