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Finding the Fourth Proportional to 455.68, 683.37 and 318.79

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Solution

The fourth proportional to 455.68, 683.37 and 318.79 is: 478.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    455.68 : 683.37 = 318.79 : x
  2. Step 2: Convert to fraction form
    455.68/683.37 = 318.79/x
  3. Step 3: Cross multiply
    455.68x = 683.37 × 318.79
  4. Step 4: Simplify right side
    455.68x = 217,851.52
  5. Step 5: Solve for x
    x = 217,851.52/455.68
  6. Step 6: Final answer
    x = 478.08

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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.