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Finding the Fourth Proportional to 1,694.12, 2,539.90 and 912.04

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Solution

The fourth proportional to 1,694.12, 2,539.90 and 912.04 is: 1,367.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,694.12 : 2,539.90 = 912.04 : x
  2. Step 2: Convert to fraction form
    1,694.12/2,539.90 = 912.04/x
  3. Step 3: Cross multiply
    1,694.12x = 2,539.90 × 912.04
  4. Step 4: Simplify right side
    1,694.12x = 2,316,490.40
  5. Step 5: Solve for x
    x = 2,316,490.40/1,694.12
  6. Step 6: Final answer
    x = 1,367.37

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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.