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Finding the Fourth Proportional to 1,672.80, 2,505.86 and 782.13

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Solution

The fourth proportional to 1,672.80, 2,505.86 and 782.13 is: 1,171.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,672.80 : 2,505.86 = 782.13 : x
  2. Step 2: Convert to fraction form
    1,672.80/2,505.86 = 782.13/x
  3. Step 3: Cross multiply
    1,672.80x = 2,505.86 × 782.13
  4. Step 4: Simplify right side
    1,672.80x = 1,959,908.28
  5. Step 5: Solve for x
    x = 1,959,908.28/1,672.80
  6. Step 6: Final answer
    x = 1,171.63

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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.