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Finding the Fourth Proportional to 455.63, 683.48 and 147.42

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Solution

The fourth proportional to 455.63, 683.48 and 147.42 is: 221.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.63 : 683.48 = 147.42 : x
  2. Step 2: Convert to fraction form
    455.63/683.48 = 147.42/x
  3. Step 3: Cross multiply
    455.63x = 683.48 × 147.42
  4. Step 4: Simplify right side
    455.63x = 100,758.99
  5. Step 5: Solve for x
    x = 100,758.99/455.63
  6. Step 6: Final answer
    x = 221.14

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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.