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Finding the Fourth Proportional to 1,191.71, 1,787.57 and 498.86

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Solution

The fourth proportional to 1,191.71, 1,787.57 and 498.86 is: 748.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,191.71 : 1,787.57 = 498.86 : x
  2. Step 2: Convert to fraction form
    1,191.71/1,787.57 = 498.86/x
  3. Step 3: Cross multiply
    1,191.71x = 1,787.57 × 498.86
  4. Step 4: Simplify right side
    1,191.71x = 891,744.31
  5. Step 5: Solve for x
    x = 891,744.31/1,191.71
  6. Step 6: Final answer
    x = 748.29

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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.