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Finding the Fourth Proportional to 1,115.94, 1,539.80 and 673.88

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Solution

The fourth proportional to 1,115.94, 1,539.80 and 673.88 is: 929.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115.94 : 1,539.80 = 673.88 : x
  2. Step 2: Convert to fraction form
    1,115.94/1,539.80 = 673.88/x
  3. Step 3: Cross multiply
    1,115.94x = 1,539.80 × 673.88
  4. Step 4: Simplify right side
    1,115.94x = 1,037,640.42
  5. Step 5: Solve for x
    x = 1,037,640.42/1,115.94
  6. Step 6: Final answer
    x = 929.84

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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.