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Finding the Fourth Proportional to 1,091.60, 1,644.68 and 945.80

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Solution

The fourth proportional to 1,091.60, 1,644.68 and 945.80 is: 1,425.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,091.60 : 1,644.68 = 945.80 : x
  2. Step 2: Convert to fraction form
    1,091.60/1,644.68 = 945.80/x
  3. Step 3: Cross multiply
    1,091.60x = 1,644.68 × 945.80
  4. Step 4: Simplify right side
    1,091.60x = 1,555,538.34
  5. Step 5: Solve for x
    x = 1,555,538.34/1,091.60
  6. Step 6: Final answer
    x = 1,425.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.