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Finding the Fourth Proportional to 1,191.28, 1,785.48 and 420.88

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Solution

The fourth proportional to 1,191.28, 1,785.48 and 420.88 is: 630.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.28 : 1,785.48 = 420.88 : x
  2. Step 2: Convert to fraction form
    1,191.28/1,785.48 = 420.88/x
  3. Step 3: Cross multiply
    1,191.28x = 1,785.48 × 420.88
  4. Step 4: Simplify right side
    1,191.28x = 751,472.82
  5. Step 5: Solve for x
    x = 751,472.82/1,191.28
  6. Step 6: Final answer
    x = 630.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.