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Finding the Fourth Proportional to 1,692, 2,538.72 and 815

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Solution

The fourth proportional to 1,692, 2,538.72 and 815 is: 1,222.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,692 : 2,538.72 = 815 : x
  2. Step 2: Convert to fraction form
    1,692/2,538.72 = 815/x
  3. Step 3: Cross multiply
    1,692x = 2,538.72 × 815
  4. Step 4: Simplify right side
    1,692x = 2,069,056.80
  5. Step 5: Solve for x
    x = 2,069,056.80/1,692
  6. Step 6: Final answer
    x = 1,222.85

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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.