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Finding the Fourth Proportional to 1,586.85, 2,380.79 and 491.43

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Solution

The fourth proportional to 1,586.85, 2,380.79 and 491.43 is: 737.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.85 : 2,380.79 = 491.43 : x
  2. Step 2: Convert to fraction form
    1,586.85/2,380.79 = 491.43/x
  3. Step 3: Cross multiply
    1,586.85x = 2,380.79 × 491.43
  4. Step 4: Simplify right side
    1,586.85x = 1,169,989.17
  5. Step 5: Solve for x
    x = 1,169,989.17/1,586.85
  6. Step 6: Final answer
    x = 737.30

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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.