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Finding the Fourth Proportional to 1,317.80, 1,979.04 and 1,138.16

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Solution

The fourth proportional to 1,317.80, 1,979.04 and 1,138.16 is: 1,709.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,317.80 : 1,979.04 = 1,138.16 : x
  2. Step 2: Convert to fraction form
    1,317.80/1,979.04 = 1,138.16/x
  3. Step 3: Cross multiply
    1,317.80x = 1,979.04 × 1,138.16
  4. Step 4: Simplify right side
    1,317.80x = 2,252,464.17
  5. Step 5: Solve for x
    x = 2,252,464.17/1,317.80
  6. Step 6: Final answer
    x = 1,709.26

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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.