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Finding the Fourth Proportional to 493.93, 681.66 and 319.78

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Solution

The fourth proportional to 493.93, 681.66 and 319.78 is: 441.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.93 : 681.66 = 319.78 : x
  2. Step 2: Convert to fraction form
    493.93/681.66 = 319.78/x
  3. Step 3: Cross multiply
    493.93x = 681.66 × 319.78
  4. Step 4: Simplify right side
    493.93x = 217,981.23
  5. Step 5: Solve for x
    x = 217,981.23/493.93
  6. Step 6: Final answer
    x = 441.32

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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.