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Finding the Fourth Proportional to 456.15, 683.79 and 147.78

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Solution

The fourth proportional to 456.15, 683.79 and 147.78 is: 221.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    456.15 : 683.79 = 147.78 : x
  2. Step 2: Convert to fraction form
    456.15/683.79 = 147.78/x
  3. Step 3: Cross multiply
    456.15x = 683.79 × 147.78
  4. Step 4: Simplify right side
    456.15x = 101,050.49
  5. Step 5: Solve for x
    x = 101,050.49/456.15
  6. Step 6: Final answer
    x = 221.53

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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.