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Finding the Fourth Proportional to 1,209.46, 1,669.78 and 943.38

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Solution

The fourth proportional to 1,209.46, 1,669.78 and 943.38 is: 1,302.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.46 : 1,669.78 = 943.38 : x
  2. Step 2: Convert to fraction form
    1,209.46/1,669.78 = 943.38/x
  3. Step 3: Cross multiply
    1,209.46x = 1,669.78 × 943.38
  4. Step 4: Simplify right side
    1,209.46x = 1,575,237.06
  5. Step 5: Solve for x
    x = 1,575,237.06/1,209.46
  6. Step 6: Final answer
    x = 1,302.43

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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.