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Finding the Fourth Proportional to 493.39, 681.12 and 318.85

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Solution

The fourth proportional to 493.39, 681.12 and 318.85 is: 440.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.39 : 681.12 = 318.85 : x
  2. Step 2: Convert to fraction form
    493.39/681.12 = 318.85/x
  3. Step 3: Cross multiply
    493.39x = 681.12 × 318.85
  4. Step 4: Simplify right side
    493.39x = 217,175.11
  5. Step 5: Solve for x
    x = 217,175.11/493.39
  6. Step 6: Final answer
    x = 440.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.