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Finding the Fourth Proportional to 1,586.79, 2,381.40 and 662.78

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Solution

The fourth proportional to 1,586.79, 2,381.40 and 662.78 is: 994.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,586.79 : 2,381.40 = 662.78 : x
  2. Step 2: Convert to fraction form
    1,586.79/2,381.40 = 662.78/x
  3. Step 3: Cross multiply
    1,586.79x = 2,381.40 × 662.78
  4. Step 4: Simplify right side
    1,586.79x = 1,578,350.25
  5. Step 5: Solve for x
    x = 1,578,350.25/1,586.79
  6. Step 6: Final answer
    x = 994.68

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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.