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Finding the Fourth Proportional to 1,179.20, 1,768.79 and 313.50

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Solution

The fourth proportional to 1,179.20, 1,768.79 and 313.50 is: 470.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,179.20 : 1,768.79 = 313.50 : x
  2. Step 2: Convert to fraction form
    1,179.20/1,768.79 = 313.50/x
  3. Step 3: Cross multiply
    1,179.20x = 1,768.79 × 313.50
  4. Step 4: Simplify right side
    1,179.20x = 554,514.10
  5. Step 5: Solve for x
    x = 554,514.10/1,179.20
  6. Step 6: Final answer
    x = 470.25

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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.