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Finding the Fourth Proportional to 493.74, 681.06 and 388.66

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Solution

The fourth proportional to 493.74, 681.06 and 388.66 is: 536.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.74 : 681.06 = 388.66 : x
  2. Step 2: Convert to fraction form
    493.74/681.06 = 388.66/x
  3. Step 3: Cross multiply
    493.74x = 681.06 × 388.66
  4. Step 4: Simplify right side
    493.74x = 264,700.78
  5. Step 5: Solve for x
    x = 264,700.78/493.74
  6. Step 6: Final answer
    x = 536.11

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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.