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Finding the Fourth Proportional to 1,318.82, 1,980.89 and 792.77

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Solution

The fourth proportional to 1,318.82, 1,980.89 and 792.77 is: 1,190.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.82 : 1,980.89 = 792.77 : x
  2. Step 2: Convert to fraction form
    1,318.82/1,980.89 = 792.77/x
  3. Step 3: Cross multiply
    1,318.82x = 1,980.89 × 792.77
  4. Step 4: Simplify right side
    1,318.82x = 1,570,386.20
  5. Step 5: Solve for x
    x = 1,570,386.20/1,318.82
  6. Step 6: Final answer
    x = 1,190.75

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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.