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Finding the Fourth Proportional to 1,191.79, 1,787.69 and 421.75

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Solution

The fourth proportional to 1,191.79, 1,787.69 and 421.75 is: 632.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.79 : 1,787.69 = 421.75 : x
  2. Step 2: Convert to fraction form
    1,191.79/1,787.69 = 421.75/x
  3. Step 3: Cross multiply
    1,191.79x = 1,787.69 × 421.75
  4. Step 4: Simplify right side
    1,191.79x = 753,958.26
  5. Step 5: Solve for x
    x = 753,958.26/1,191.79
  6. Step 6: Final answer
    x = 632.63

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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.