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Finding the Fourth Proportional to 1,191.86, 1,787.86 and 411.93

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Solution

The fourth proportional to 1,191.86, 1,787.86 and 411.93 is: 617.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.86 : 1,787.86 = 411.93 : x
  2. Step 2: Convert to fraction form
    1,191.86/1,787.86 = 411.93/x
  3. Step 3: Cross multiply
    1,191.86x = 1,787.86 × 411.93
  4. Step 4: Simplify right side
    1,191.86x = 736,477.04
  5. Step 5: Solve for x
    x = 736,477.04/1,191.86
  6. Step 6: Final answer
    x = 617.93

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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.