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Finding the Fourth Proportional to 777.67, 1,166.23 and 315.34

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Solution

The fourth proportional to 777.67, 1,166.23 and 315.34 is: 472.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    777.67 : 1,166.23 = 315.34 : x
  2. Step 2: Convert to fraction form
    777.67/1,166.23 = 315.34/x
  3. Step 3: Cross multiply
    777.67x = 1,166.23 × 315.34
  4. Step 4: Simplify right side
    777.67x = 367,758.97
  5. Step 5: Solve for x
    x = 367,758.97/777.67
  6. Step 6: Final answer
    x = 472.90

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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.