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Finding the Fourth Proportional to 677.33, 1,015.79 and 312.42

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Solution

The fourth proportional to 677.33, 1,015.79 and 312.42 is: 468.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.33 : 1,015.79 = 312.42 : x
  2. Step 2: Convert to fraction form
    677.33/1,015.79 = 312.42/x
  3. Step 3: Cross multiply
    677.33x = 1,015.79 × 312.42
  4. Step 4: Simplify right side
    677.33x = 317,351.55
  5. Step 5: Solve for x
    x = 317,351.55/677.33
  6. Step 6: Final answer
    x = 468.54

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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.