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Finding the Fourth Proportional to 1,109.12, 1,662.18 and 646.64

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Solution

The fourth proportional to 1,109.12, 1,662.18 and 646.64 is: 969.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.12 : 1,662.18 = 646.64 : x
  2. Step 2: Convert to fraction form
    1,109.12/1,662.18 = 646.64/x
  3. Step 3: Cross multiply
    1,109.12x = 1,662.18 × 646.64
  4. Step 4: Simplify right side
    1,109.12x = 1,074,832.08
  5. Step 5: Solve for x
    x = 1,074,832.08/1,109.12
  6. Step 6: Final answer
    x = 969.09

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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.