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Finding the Fourth Proportional to 491.46, 678.24 and 281.70

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Solution

The fourth proportional to 491.46, 678.24 and 281.70 is: 388.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.46 : 678.24 = 281.70 : x
  2. Step 2: Convert to fraction form
    491.46/678.24 = 281.70/x
  3. Step 3: Cross multiply
    491.46x = 678.24 × 281.70
  4. Step 4: Simplify right side
    491.46x = 191,060.21
  5. Step 5: Solve for x
    x = 191,060.21/491.46
  6. Step 6: Final answer
    x = 388.76

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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.