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Finding the Fourth Proportional to 769.50, 1,154.25 and 313.50

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Solution

The fourth proportional to 769.50, 1,154.25 and 313.50 is: 470.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.50 : 1,154.25 = 313.50 : x
  2. Step 2: Convert to fraction form
    769.50/1,154.25 = 313.50/x
  3. Step 3: Cross multiply
    769.50x = 1,154.25 × 313.50
  4. Step 4: Simplify right side
    769.50x = 361,857.38
  5. Step 5: Solve for x
    x = 361,857.38/769.50
  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.