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Finding the Fourth Proportional to 1,376.72, 2,065.82 and 646.31

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Solution

The fourth proportional to 1,376.72, 2,065.82 and 646.31 is: 969.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,376.72 : 2,065.82 = 646.31 : x
  2. Step 2: Convert to fraction form
    1,376.72/2,065.82 = 646.31/x
  3. Step 3: Cross multiply
    1,376.72x = 2,065.82 × 646.31
  4. Step 4: Simplify right side
    1,376.72x = 1,335,146.56
  5. Step 5: Solve for x
    x = 1,335,146.56/1,376.72
  6. Step 6: Final answer
    x = 969.80

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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.