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Finding the Fourth Proportional to 2,631.79, 3,946.87 and 782.56

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Solution

The fourth proportional to 2,631.79, 3,946.87 and 782.56 is: 1,173.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,631.79 : 3,946.87 = 782.56 : x
  2. Step 2: Convert to fraction form
    2,631.79/3,946.87 = 782.56/x
  3. Step 3: Cross multiply
    2,631.79x = 3,946.87 × 782.56
  4. Step 4: Simplify right side
    2,631.79x = 3,088,638.94
  5. Step 5: Solve for x
    x = 3,088,638.94/2,631.79
  6. Step 6: Final answer
    x = 1,173.59

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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.