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Finding the Fourth Proportional to 491.91, 678.87 and 270.90

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Solution

The fourth proportional to 491.91, 678.87 and 270.90 is: 373.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.91 : 678.87 = 270.90 : x
  2. Step 2: Convert to fraction form
    491.91/678.87 = 270.90/x
  3. Step 3: Cross multiply
    491.91x = 678.87 × 270.90
  4. Step 4: Simplify right side
    491.91x = 183,905.88
  5. Step 5: Solve for x
    x = 183,905.88/491.91
  6. Step 6: Final answer
    x = 373.86

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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.