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Finding the Fourth Proportional to 1,319.12, 1,979.16 and 669.32

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Solution

The fourth proportional to 1,319.12, 1,979.16 and 669.32 is: 1,004.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,319.12 : 1,979.16 = 669.32 : x
  2. Step 2: Convert to fraction form
    1,319.12/1,979.16 = 669.32/x
  3. Step 3: Cross multiply
    1,319.12x = 1,979.16 × 669.32
  4. Step 4: Simplify right side
    1,319.12x = 1,324,691.37
  5. Step 5: Solve for x
    x = 1,324,691.37/1,319.12
  6. Step 6: Final answer
    x = 1,004.22

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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.