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Finding the Fourth Proportional to 1,191.70, 1,787.89 and 461.08

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Solution

The fourth proportional to 1,191.70, 1,787.89 and 461.08 is: 691.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.70 : 1,787.89 = 461.08 : x
  2. Step 2: Convert to fraction form
    1,191.70/1,787.89 = 461.08/x
  3. Step 3: Cross multiply
    1,191.70x = 1,787.89 × 461.08
  4. Step 4: Simplify right side
    1,191.70x = 824,360.32
  5. Step 5: Solve for x
    x = 824,360.32/1,191.70
  6. Step 6: Final answer
    x = 691.75

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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.