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Finding the Fourth Proportional to 491.70, 678.56 and 270.66

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Solution

The fourth proportional to 491.70, 678.56 and 270.66 is: 373.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.70 : 678.56 = 270.66 : x
  2. Step 2: Convert to fraction form
    491.70/678.56 = 270.66/x
  3. Step 3: Cross multiply
    491.70x = 678.56 × 270.66
  4. Step 4: Simplify right side
    491.70x = 183,659.05
  5. Step 5: Solve for x
    x = 183,659.05/491.70
  6. Step 6: Final answer
    x = 373.52

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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.