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Finding the Fourth Proportional to 1,609.16, 2,412.12 and 685.32

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Solution

The fourth proportional to 1,609.16, 2,412.12 and 685.32 is: 1,027.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,609.16 : 2,412.12 = 685.32 : x
  2. Step 2: Convert to fraction form
    1,609.16/2,412.12 = 685.32/x
  3. Step 3: Cross multiply
    1,609.16x = 2,412.12 × 685.32
  4. Step 4: Simplify right side
    1,609.16x = 1,653,074.08
  5. Step 5: Solve for x
    x = 1,653,074.08/1,609.16
  6. Step 6: Final answer
    x = 1,027.29

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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.