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Finding the Fourth Proportional to 1,215.37, 1,677.24 and 861.92

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Solution

The fourth proportional to 1,215.37, 1,677.24 and 861.92 is: 1,189.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.37 : 1,677.24 = 861.92 : x
  2. Step 2: Convert to fraction form
    1,215.37/1,677.24 = 861.92/x
  3. Step 3: Cross multiply
    1,215.37x = 1,677.24 × 861.92
  4. Step 4: Simplify right side
    1,215.37x = 1,445,646.70
  5. Step 5: Solve for x
    x = 1,445,646.70/1,215.37
  6. Step 6: Final answer
    x = 1,189.47

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.